It matters.
First, not all users need your huge CSS file, in terms of downloading. Specially when they're on mobile phones and cache is crap.
A ~9000 rules CSS file will load and become COSSM slower than one that has 1000 or 10. It is linear increment. Make a test to see it for yourself.
A bloated CSS is more network time. Therefore, slower loading.
A bloated CSS will contain slower selectors, therefore slower rendering time and painting speed.
When you count all these things, you will see radical speed performance.
Re:Relearn CSS layout
by BurningFrog on Monday June 17, 2019 @11:25AM
(#20203879)
Maybe. You need to measure these things and get a feel for the actual performance impact to make informed decisions.
Rule 1 of performance: Your intuitions are not reliable.
Re:Relearn CSS layout
by saidajigumi on Monday June 17, 2019 @02:20PM
(#20205898)
Upthread, this commenter did post specific measurements from production projects.
Does download size matter? Why bother with compression or minification?
Re:Relearn CSS layout
by sheriffderek on Tuesday June 18, 2019 @05:14PM
(#20218480)
No. No way. If you're CSS is a problem - then you are doing something really really wrong.
If a human isn't going to read the CSS and the computer handles it without performance problem, I say no.
Those are of course two quite important ifs!