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If you want to get help, you must provide with this information. This single PHP file doesn't help to get answers.

To prevent missunderstanding: 1.) Is this image processing a pure PHP function or a combination PHP/Javascript? 2.) Does it work if Javascript is off?

Yes..... I believe ;)

Of course, there is support in lscache for webp images, but you don't want to have this solution. You asked for Retina detection.

Okay, I give up. You are right and I am wrong.... But for everybody else who is thinking like this collegue, this is neither a LSWS nor a Lscache issue....

Either we are in a loop or you don't want to understand why you can't detect Retina display. Also Journal can't. To me, Journal doesn't detect Retina display, it detects screen resolution by CSS media queries, but not for HighRes images.

Why do you ask for different views if Journal already does it?!

It doesn't matter if it is a standard feature or not or LiteSpeed or Apache or whatever, but it is not a must have feature, so you could use it, but you don't must. Basically Retina display is not made for HighRes images. It increases screen resolution for better reading of text, so you don't...

Sorry, this is nonsense. HighRes Images means much more data size to transfer and a lot of rewrite cache rules to differentiate devices. Your strategy for best performance of your shop isn't really logical. With LiteSpeed and Lscache you get the best instruments, but you distroy it with useless...

Not every Mac device has a Retina Display and can't be detected because Apple sends no information if device has a Retina display or not.

What would you do if would have a function to detect Retina display?

@AndreyPopov Do you like to get "The One And Only Rewrite Rule" to identify if browser supports webp images? Only 1 line is needed in .htaccess. It's a replacement for all your vary rewrite cache rules.

Can't confirm what you are reporting. Everything works as it should, but page is (very) slow from Europe. Tested with smartphone and computer

If you don't want to use LSWS any longer: https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:cpanel:whm-lsws-plugin-uninstall

Google is your friend https://www.google.com/search?q=ubuntu+imagemagick+install

This is not completely correct. The [L] flag only stops rewrite processing, but doesn't stop processing at all like [END] flag depending on httpd.conf. Only rewrite rules are affected, but you are right to place cache rules at the very top of .htaccess.

You are talking about LSMCD. You know that is not Lscache?

Penetration test for your "code" What happens if these UAs visit your page? ;) They are very popular all over the world and they are all crawler like. okhttp/2.5.0 Safari/14609.1.20.111.8 CFNetwork/978.2 Darwin/18.7.0 (x86_64) Dalvik/2.1.0 (Linux; U; Android 10; ART-L29 Build/HUAWEIART-L29)...

https://forum.openlitespeed.org/

Do You use OpenLiteSpeed?