Answers about performance
Questions and answers from the Croct community about performance.
After dropping our render-blocking test snippet, LCP finally recovered
Sharing a result in case it helps someone deciding. Our old testing tool loaded a synchronous, render-blocking snippet in the head. It cost us around half a…
For users far from your servers, does the sub-90ms P95 still apply?
My audience is genuinely global, spread across regions that I suspect are far from wherever Croct runs. I want to understand the published sub-90ms P95 with…
Will personalizing a VTEX storefront add flicker or slow down the page?
I run a VTEX store and I am nervous about adding personalization. I read about older client-side testing tools that caused a flash of the default content and…
Did Croct stay fast during our campaign traffic spike on Next?
we ran a big campaign yesterday that multiplied traffic on our personalized Next routes for the whole day, and i was braced for latency to climb once the load…
Left our Contentful plus VWO combo, was the anti-flicker delay really the problem?
We ran Contentful for content and VWO for testing. The VWO anti-flicker snippet, the one that hides the page while the script loads, always looked like our…
What is the default content fetch timeout in the React SDK and can I tighten it?
Testing on a throttled connection I noticed a content fetch hang for what felt like several seconds before teh fallback kicked in. I would rather it give up…
Now that we are at real traffic, is the sub-90ms P95 actually holding?
We launched Croct a few months ago after leaving a testing tool whose render-blocking snippet was killing us. Early on the latency looked great and I noted…
Coming off Optimizely on our headless storefront, does Croct avoid the render-blocking snippet?
our Hydrogen storefront has been running Optimizely and the snippet is a real cost. It loads synchronously on the critical path, and even with no experiment…
Does running Croct plus the Clarity integration slow the page down?
I already watch Clarity's own recording script warily, it is not free on the main thread. Now I want to add the Croct Clarity integration on top and I am…
Keeping Oxygen's full-page cache while personalizing one hero section, is that possible?
Homepage on Hydrogen, served from Oxygen's full-page cache with CacheLong, hit rate is excellent and TTFB is around 40ms. Now the brief says personalize the…
Will content resolution hold up during Black Friday traffic, and what if it times out?
Preparing a Hydrogen store for Black Friday. Last year a client-side testing script fell over under load and blanked our hero for a chunk of the morning. Not…
What does personalization cost us in LCP on mobile?
80% of our traffic is mid-range Android. Current Lighthouse mobile: LCP 2.4s, TBT 190ms. With our previous client-side tool the anti-flicker snippet held the…