The problem is the web browser.
I’ve got 16 gb of ram and the browser is using most of them. I can literally see the swap space emptying when i have (as in “im forced to”) sacrifice my browsing session (xkill the browser) due to constant swap out to disk.
And I’m using a pci gen 3 nvme disk, and already lowered swappiness.
The problem is the web browser.
At this point, my primary use case for ad blocking isn't the ad blocking itself, it is 1. the security of blocking ads, one of the worst vectors for attacks in the while and 2. the greatly reduced system resources my browser uses. The ad blocking itself is a further bonus.
If even there you have no success, I'd suggest you try something like EndeavorOS. Browsers have issues but that is not normal. You're not using Debian stable on the desktop, right?