I'm trying to find a solution for high Max Potential First Input Delay on a website I'm auditing. I'm evaluating all the Long Tasks once FMP is triggered. While most are being marked as Recalculated Style, I'm not getting the exact code location of where that is, as shown in the attached screenshot.
Anyone has a recommendation of how to better evaluated the exact code causing the bottleneck
Chrome DevTools Performance Long Task Missing script line
Reply to wOxxOm:
OK so to understand you are referring to the Reveal feature as opposed to the to Bottom-up view.
Related
I am working on a non-linear network-optimization problem. When I run a large problem instance on the lab high-performance computers (imposing the time limit of 1 or 2 hours), those computers give me the output when the time is exhausted.
I wanted to use Google Collab to run the same code and to share it with my supervisors (they don't have Pyscipopt installed on their computers). However, when the problem size is small – all is good, but when the problem size is large, it says that the execution is completed (on the bottom of the screen) along with the time it took and a small red exclamation mark BUT it does not show any output for the large-size network optimization problems (neither it prints the solution nor it explains what is the reason/error of this behaviour).
Again, the same code works perfectly fine on high-performance computers, so I do not think there are any problems with syntax.
Please let me know if there are any solutions to the problem described.
Kind regards,
Lidiia
I tried to change "None" in the hardware accelerator to GPU and CPU. I tried to proofread the code in order to find any mistakes. I tried to not leave the Google Collab to run the code at night (I read somewhere that kernel stops working if there is inactivity) so I tried to click on something there to prevent the execution from stopping. Nothing worked.
Chromium DevTools used to have this very useful feature where, after doing a performance profile, lines viewed in the Sources tab would display how much execution time they took. Like this:
However, I cannot get this to work anymore. What gives? Did they remove it? Do you I need to enable them? Is this a bug?
I have a hand-me-down WordPress site (passed down from one dev to another, to another, and so on), which is more or less a garbled mess. I'm on the fence between wanting to optimize it and starting fresh. After checking the current state of CSS files with Chrome's Code Coverage, it seems that a lot of the rules (98%, according to the Code Coverage tool) are unused.
Other than testing different resolutions and checking if anything is changing, is there a better (more efficient) way for me to know whether the CSS rules are truly unused? I've been resizing the browser window, and reloading the page (just one out of many), but the number of unused bytes was always the same.
I am having problems with performing actions on the Dataprep dashboard. In particular, when I try to merge two datasets, its just loading there for >20 minutes without a result. I tried to also add a new receipe or dataset and I only get that it gets stuck at 99%.
What is wrong with Dataprep Dashboard?
While I can't provide a specific reference, I've found that this can happen when you have a bad cache entry in your browser (either from a recent update to Dataprep or something related to the Flow itself).
Our team has found that this can often be resolved, but you can test that theory by opening a new Incognito window in Chrome (or another browser altogether) and loading your recipe there. If the problem goes away, it's likely that it was a caching issue—so you can just clear your cache for the Dataprep domain. (This has the advantage of also isolating things like LocalStorage.)
If you don't want to have to log in to your account from another window, you can also try hard-refreshing the page (Windows/Linux: Ctrl+F5, Mac: ⌘ Cmd+Shift+R)—or opening the Chrome Dev Tools, switching to the Network panel, checking the "Disable cache" button, and reloading the page. The plus here is that it allows you to test the issue without breaking your ability to recreate it (like if you want to submit a bug report).
Best of luck!
I've read this article about analyzing runtime performance. The image below is copied from this article. If you check this image, there are yellow highlighted execution time hints for JS files next to each line in the file.
I find this line level profiling feature pretty useful and I would like to try it in my own projects, too.
However, when I open a JS source file in the sources tab, I cannot see it. Note that, I already took a performance profiling snapshot. But still I cannot see this execution time hints.
How can I reveal this feature?
Thanks.
it's seems that it's removed to new tab.
you can try this:
open javascript profile tab (or ctrl+ shift + p on win and type javascript profile)
start to record the site and refresh
stop the record
click on one of the js file
enter image description here
you got exactly what you need
enter image description here
I wasn't seeing the line by line timings from the profiler either, and it was driving me crazy for days.
My code was written in typescript and converted to JScript with source maps using esbuild.
When I turned source maps off in esbuild, the line timings reappeared from the profiler!
The Jscript is close enough to the Typescript so the line timings are still useful.
I could have sworn I'd seen it work with source maps in the past but now I'm not so sure. It would be great if the line timings did work with source maps but it kind of makes sense that they don't.
Has anyone else seen profiler line timings work on code with sourcemaps turn on?