Is it worth updating php from 5.6 to 8 on the server where Bitrix is ​​running?

Question

PHP

They gave me a site where I need to increase productivity. Styles compressed, scripts compressed, autocaching turned on, but Google continues to show a miserable 9% performance. I thought it might be worth updating the php version, but will I break the site? Can caching on the nginx side fix the situation?

Answer 1

since 5.6

Need

up to 8

Not necessary. Better than 7.2

Google continues to show a measly 9% performance

first finish the server business, and then go to the front.
If Bitrix is ​​still at 5.6, then there you need to look at the muscle, and indeed everything is a complex.
Start with a regular site check and performance measurement.

but I won't break the site

you can break it, in what year were the last Bitrix updates installed?
And don't ask the same question
How to set up caching for faster return of statics in nginx?

Answer 2

If it's about performance, then you won't win.
If you have 3 seconds php gives the page, then you need to dig Bitrix itself, most likely a plug in working with the database.