[giovannibajo1]

It should be true, but the reality is that most ad blockers have such a complex ruleset to match that they can actually go slower and use more RAM than not running them.

The graphs that uBlock shows are very compelling: https://github.com/chrisaljoudi/uBlock

I'm not saying that Apple tried hard enough; the content blockers on iOS are JIT-compiled to native ARM 64-bit code, so maybe they didn't have the codepath ready for 32-bit and/or they didn't bother. But it's surely not just a technical excuse.