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Pages slow before they stop
Outages rarely arrive out of nowhere. Response times drift upward for hours or days first. If nobody is watching that curve, the first signal you get is a full outage instead of an early warning.
Every PulseStack check measures how long your site takes to respond and stores it. So instead of a sudden outage, you get a curve you can read - and time to act before slow becomes down.
Free plan monitors 5 endpoints with no card. 14-day trial on every paid plan.
Live HTTP request from our network - the same check PulseStack runs as often as every 30 seconds.
Live check - enter a URL and watch its real response time
Response time captured and stored, on every single probe
Fastest check interval on Enterprise, for the earliest signal
Monitor types, from HTTP and API to DNS and Domain Expiry
Native alert channels the moment latency crosses your threshold
Uptime is a lagging indicator. By the time a check returns an error, users have already felt it. Response time moves first. A page that answered in a blink last week and drags today is telling you something is wrong upstream - and PulseStack has been recording that story on every check the whole time.
Slow degradation is where quiet revenue leaks and 3am pages come from. Here is how it plays out.
Outages rarely arrive out of nowhere. Response times drift upward for hours or days first. If nobody is watching that curve, the first signal you get is a full outage instead of an early warning.
A page that takes too long to respond is functionally down for the visitor who gives up waiting. Checkout, sign-in and API calls all quietly fail while your uptime graph still shows green.
A daily average smooths over the spikes that actually hurt. Without stored per-check timing across multiple locations, a regional slowdown or a slow database query never shows up until it tips into failure.
When something did break at 3am, you need the history that led up to it. PulseStack stores the response time from every check so you can scroll back and see exactly when the trend turned.
Add your first monitor in under a minute and watch the timing history build from the very first check.
No agents, no config files. Point us at an endpoint and the timeline starts building.
Point PulseStack at any URL, API endpoint, host or port. HTTP and API monitors even let you send custom request headers so you time authenticated and versioned endpoints exactly as your users hit them.
On each interval we measure how long the endpoint takes to respond and store that number. Free checks every 5 minutes, paid plans every 60 seconds, Enterprise every 30 seconds.
Response times accumulate into a timeline you can read at a glance. A creeping line is your early warning that something upstream - a CDN, a database, a third party - is starting to struggle.
Pair timing with a consecutive-failure threshold so one blip stays quiet but a sustained slowdown reaches you across any of eight channels, from Slack and Teams to PagerDuty and SMS.
There is nothing to switch on. Response time is measured and stored on each probe across every monitor type, so the moment a value drifts you have the history to prove it and the multi-location context to place it.
Response time is not just for web pages. Every monitor type records how long it took to answer.
Full page and endpoint checks with response timing on every request.
Confirm expected text is present, and time how long the render takes.
Time JSON endpoints with custom request headers for auth and versioning.
Measure round-trip latency to any host at the network level.
Check a specific port is open and time how quickly it answers.
Watch cron jobs and workers by expecting a regular ping.
Resolve records and track how long resolution takes over time.
Track registration so a lapse never blindsides you.
The more often we check, the sooner a slowdown shows up. Pick the cadence your plan needs.
Every check still records response time, at a five-minute cadence.
A fresh timing point every minute across all monitor types.
The tightest cadence, for the earliest possible warning.
Timing is only useful when it lives alongside everything else you need to run a monitor properly. It all comes in the box.
Pair timing with a consecutive-failure threshold and route the alert to any of eight native channels. No integrations to wire up.
SMS and voice are an add-on, included on Team and Enterprise.
Free forever on five monitors, or step up to 60-second checks whenever you are ready.
An honest look at the trade-offs, so you know what this does and does not do.
A basic checker tells you a site is reachable and nothing more. You learn about a slowdown when it finally becomes an outage.
Response time recorded on every check, across every monitor type and location, kept in history, and wired to eight alert channels with a noise threshold.
Full APM traces every function call but demands heavy instrumentation. PulseStack watches from the outside, the way your users actually experience the site.
Time authenticated API endpoints with custom headers and catch a slow query or a cold cache the moment latency starts creeping, not when the pager finally fires.
Keep a performance record for every client site across multiple locations, and hand them a public status page that shows real, current response behaviour.
Route sustained slowdowns to PagerDuty or Teams with a consecutive-failure threshold, so real degradation reaches you and single blips do not.
Response time monitoring measures how long your server takes to respond to a request, measured in milliseconds. PulseStack™ sends check requests at regular intervals and records the time between sending the request and receiving the first byte of the response. This gives you a continuous picture of your service performance over time.
Response time (also called Time to First Byte or TTFB) measures how quickly your server starts sending data back. Page load time includes everything after that: downloading HTML, CSS, JavaScript, images, and rendering the page in the browser. Response time monitoring focuses on the server-side component because that is what you directly control. If your server is slow, no amount of frontend optimisation will fix the user experience.
Percentiles describe the distribution of your response times. P50 (median) means half of all requests were faster. P95 means 95% of requests were faster. P99 means 99% were faster. Percentiles are more useful than averages because averages can hide outliers. If 99 requests take 100ms and one takes 10 seconds, the average looks fine at 199ms, but the P99 reveals that one in a hundred users is waiting 10 seconds.
Start with industry benchmarks. For most web applications, a warning at 500ms and a critical alert at 1500ms is a reasonable starting point. For payment APIs or real-time systems, set tighter thresholds. For background processes, you can afford more generous limits. Monitor for a week to establish your baseline, then set thresholds slightly above your normal P95 to catch genuine degradation without false alarms.
On paid plans, checks run as frequently as every 30 seconds from each enabled monitoring location. The free plan supports 3-minute intervals. With 7 locations checking every 30 seconds, you get 14 data points per minute, giving you high-resolution performance data that catches even brief slowdowns.
Yes. PulseStack monitors any HTTP or HTTPS endpoint, including REST APIs, GraphQL endpoints, webhooks, and health check URLs. You can configure custom request methods (GET, POST, PUT), headers, and body content. Response time is measured for every request, regardless of monitor type.
Response times vary by location because of network distance. A server in London will respond faster to a check from Frankfurt (nearby) than from Bangalore (far away). PulseStack shows response times per location so you can identify regional performance issues, CDN misconfigurations, or routing problems that affect specific geographic areas.
Common causes include traffic surges, database query bottlenecks, server resource exhaustion (CPU or memory), third-party API slowdowns, CDN cache misses, DNS resolution delays, and deployment-related issues. PulseStack records exact timestamps for every spike so you can correlate them with deployments, traffic patterns, or external events.
Yes. When your site uses a CDN, response time monitoring measures the time to get a response from the CDN edge, not your origin server. This is exactly what your users experience. If a CDN edge starts serving cache misses and falling back to origin, the response time increase shows up immediately in your monitoring data.
PulseStack provides a full API for accessing your monitoring data, including response time history, percentile calculations, and trend data. You can integrate this data into your own dashboards, generate custom reports, or feed it into other tools in your observability stack.
Every check timed and stored, from the free plan up. Add a monitor now and read the trend before it turns into downtime.
No card on Free. 14-day trial on paid plans. Annual billing saves 20%.