ua-tracer by Paul Kinlan

trace 84ZmJTjw

ua-tracer

what does a user agent actually fetch, follow & run?

← all traces

Trace 84ZmJTjw

First seen: 2026-08-13 23:53:35.430 UTC
User-Agent: amazon-Quick-on-behalf-of-0a4c195b
Bot verification: Not a known bot (no IP-range check applies).

What this user agent did

Directly-referenced assets:

✓ fetched CSS ✓ fetched JS ✓ fetched image ✓ fetched font (HTML)

Document-level link hints:

✗ fetched favicon ✗ fetched apple-touch-icon ✗ fetched web manifest ✓ fetched preload ✓ fetched prefetch

Second-level follows (proves it parsed the linking file):

✓ followed CSS background-image ✓ followed CSS @font-face ✗ followed manifest icon ✓ followed CSS @import

Frames (does it descend into iframes?):

✓ fetched iframe document ✓ descended into iframe (loaded inner image)

Reporting (a report-only CSP is violated by inline styles; reports can arrive via HTTP headers with no JS, or via in-page beacons):

✗ sent a CSP/Reporting report (any path) ✗ delivered via report-uri/Report-To header (no JS) ✗ delivered via in-page beacon (securitypolicyviolation / ReportingObserver)

Social embed (Open Graph / Twitter card images):

✗ fetched og:image ✗ fetched twitter:image

JavaScript execution:

✓ EXECUTED classic JS ✓ EXECUTED ES module ✓ posted client timing

Server-side request waterfall

Every request the server received for this trace, in receive order. +ms is the delta from the homepage request.

ReceivedΔKindMethodUser-Agent
2026-08-13 23:53:35.430 UTC +0 ms homepage GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "u=0, i",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "document",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "none",
  "sec-fetch-user": "?1",
  "traceparent": "00-c4e653f230e7a2e3f79c9670130dd419-a1f622739c4c62f8-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.392 UTC +1962 ms CSS GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "u=0",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-6b63a9b2ffbf1537d34cfaab98cd1b17-1b19d797e1c79249-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.405 UTC +1975 ms font (HTML) GET amazon-Quick-on-behalf-of-0a4c195b
request headers (20) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "pragma": "no-cache",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "font",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-6c07f8068ce24587b352db03380777f7-624033939247f9a9-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.409 UTC +1979 ms preload (image) GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-917a639bd1763853442506d22a6a3f37-439aeee146df02f4-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.413 UTC +1983 ms prefetch GET amazon-Quick-on-behalf-of-0a4c195b
request headers (20) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "u=4, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "sec-purpose": "prefetch",
  "traceparent": "00-1fd07a04de52c1a7a8ba7a982bdc8e42-ac9e68fb8ab43ed1-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.427 UTC +1997 ms image GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-0f76f526f417ad490f25ef57c1c1ec8a-7d9515d30e85bd1b-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.429 UTC +1999 ms iframe document GET amazon-Quick-on-behalf-of-0a4c195b
request headers (20) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "u=0, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "iframe",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-1192489a6dc3286c2001cf008834da03-64f0c41dc39acd61-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.430 UTC +2000 ms JS GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-d7fa398a4022cb070e552533ba77a45d-210272c49cb941d3-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:37.457 UTC +2027 ms ES module GET amazon-Quick-on-behalf-of-0a4c195b
request headers (20) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "pragma": "no-cache",
  "priority": "u=1",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "script",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-17fc7f90a211d77bd15915da5d1cb4d0-34b26856245eafc5-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:38.309 UTC +2879 ms CSS @import (nested stylesheet) GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "text/css,*/*;q=0.1",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/84ZmJTjw/wTJrYa5i/style.css",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "style",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-d96b95846f07a081af90a7424970d8c9-8689a498c43378dc-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:40.020 UTC +4590 ms CSS background-image GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "i",
  "referer": "https://uatracer.com/r/84ZmJTjw/wTJrYa5i/style.css",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-db735d5cc0e3f0e32c7d099a40534e80-ad4271428d9918a4-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:40.022 UTC +4592 ms CSS @font-face GET amazon-Quick-on-behalf-of-0a4c195b
request headers (20) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "pragma": "no-cache",
  "priority": "u=0",
  "referer": "https://uatracer.com/r/84ZmJTjw/wTJrYa5i/style.css",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "font",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-4c08c141ab10ceb27f8debb1b214a176-6aa998888708af2e-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:40.094 UTC +4664 ms image inside iframe GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "i",
  "referer": "https://uatracer.com/r/84ZmJTjw/wTJrYa5i/iframe",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-db5fde32185fc6e36d4f27f79597e7a2-f260a68385757e54-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:40.118 UTC +4688 ms JS executed beacon GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-991fdc24820ba56c007d71f922184bda-6120651297b2ac56-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:40.135 UTC +4705 ms ES module executed GET amazon-Quick-on-behalf-of-0a4c195b
request headers (19) 
{
  "accept": "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "priority": "i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "image",
  "sec-fetch-mode": "no-cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-c02c39f3e8635bd7d729b48a418c5c0e-282d9185d65f73dc-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:42.534 UTC +7104 ms client timing POST POST amazon-Quick-on-behalf-of-0a4c195b
request headers (22) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate, br, zstd",
  "authorization": "[redacted]",
  "cache-control": "no-cache",
  "content-length": "2232",
  "content-type": "application/json",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "origin": "https://uatracer.com",
  "pragma": "no-cache",
  "priority": "u=4, i",
  "referer": "https://uatracer.com/",
  "sec-ch-ua": "\"Chromium\";v=\"148\", \"HeadlessChrome\";v=\"148\", \"Not/A)Brand\";v=\"99\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"Windows\"",
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
  "traceparent": "00-8c460d91cc12fe5d431deac1962505d2-e103a7cbb1cb9d73-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
2026-08-13 23:53:47.889 UTC +12459 ms image GET amazon-Quick-on-behalf-of-0a4c195b
request headers (11) 
{
  "accept": "*/*",
  "accept-encoding": "gzip, deflate",
  "authorization": "[redacted]",
  "cookie": "[redacted]",
  "host": "uatracer.com",
  "traceparent": "00-3ac785a5dfaee591ee9dae48c3b18675-f30e8f3a76fe7b44-01",
  "tracestate": "",
  "user-agent": "amazon-Quick-on-behalf-of-0a4c195b",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-3ac785a5dfaee591ee9dae48c3b18675-3d3ff6624f8094a9-01",
  "x-deno-userspace-tracestate": ""
}
2026-08-14 04:30:01.615 UTC +16586185 ms font (HTML) GET Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1
request headers (14) 
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip",
  "accept-language": "zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7",
  "cache-control": "no-cache",
  "connection": "keep-alive, close",
  "host": "uatracer.com",
  "pragma": "no-cache",
  "traceparent": "00-82ee4f4feb6956fc916f772899449582-f7db38a3f3f51b33-01",
  "tracestate": "",
  "upgrade-insecure-requests": "1",
  "user-agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1",
  "via": "HTTP/1.1 ord.vultr.prod.deno-cluster.net",
  "x-deno-userspace-traceparent": "00-82ee4f4feb6956fc916f772899449582-c6b40ceaad97c4ad-01",
  "x-deno-userspace-tracestate": ""
}

Client-side resource waterfall

Reported by performance.getEntriesByType('resource') after JS ran in the UA. This proves a real browser-grade engine, not just a downloader.

ResourceInitiatorStartDurationTimeline
style.css link 1886ms 833ms
font.woff2 link 1886ms 1083ms
preload.png link 1886ms 1288ms
prefetch.png link 1889ms 1533ms
iframe iframe 1905ms 2310ms
photo.png img 1905ms 1766ms
main.js script 1905ms 2661ms
module.js script 1906ms 2580ms
import.css css 2721ms 1198ms
css-bg.png css 3926ms 1394ms
css-font.woff2 css 3927ms 1697ms
js-ran.gif?t=1786665219668 img 4568ms 1596ms
module-ran.gif?t=1786665219671 img 4570ms 1830ms