Answers about performance
Questions and answers from the Croct community about performance.
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…
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…
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…
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…
Do the tracking and evaluate calls hurt INP on interaction?
watching INP on a few interaction-heavy pages. I want to isolate whether the client-side evaluate and event-tracking calls are adding main-thread work on…
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…
Does resolving personalization server-side add a TTFB penalty?
evaluating croct and the one thing holding me back is TTFB. right now most of our pages are basically static, we sit around 180ms TTFB from origin and i do…
Does server-side fetchContent add a TTFB penalty on my Next app?
i moved our hero personalization out of a client hook and into a server fetchContent call in the App Router. my assumption was that the extra server-side…
If the content API is slow, does my page hang or fall back?
I always plan for the worst case, and my worst case here is a slow personalization call on a bad network. If the content API takes two seconds to respond,…
We are adding a dozen audiences, will evaluation start to drag on each request?
We are scaling from two audiences to more than a dozen on the same set of slots. I am a bit worried about how it behaves when I add many audience, because…