Improve HTML filtering performance

[ameshkov]

Currently, HTML filtering adds quite a noticeable overhead to the overall page loading speed.

Steps to reproduce

1. Open view-source:https://www.rbc.ru/
2. Measure the loading time (in my case it's about 200ms)
3. Now add this rule to the user rules: @@||rbc.ru^$content
4. Refresh the page a few times and measure the loading time
5. In my case it's about 400ms on average, so a 200ms overhead

What is it that slows it down that much?

Things to do

1. Change the way it works and keep the overhead in acceptable limits.
2. Add performance tests specifically for HTML filtering, we shouldn't miss this again.

[emikaadeo-git]

Hi, I have the same issue with Safari and AdGuard for Mac.
The websites loading speeds are noticable slower with AdGuard than without.
I thought it was fixed in #1522 but it's not.
It actually stops me from using AdGuard for Mac.

[sfionov]

We sped things up in CL1.13. However, it may take some time before first CL1.13 nightlies.

[emikaadeo-git]

Hi, is there a chance you can backport this fix to CL 1.12 and release with AdGuard 2.12 ?

[SeriousHoax]

Hi, is there a chance you can backport this fix to CL 1.12 and release with AdGuard 2.12 ?

It would be great if this can be done.

We sped things up in CL1.13. However, it may take some time before first CL1.13 nightlies.

Can you give us an ETA on this? When can we expect a CL 1.13 based Nightly to be released that contains this fix?

[ameshkov]

Expect the first nightlies with it in about 2 weeks from now. There're quite a lot of changes in v1.13, backporting would be problematic.

[SeriousHoax]

Expect the first nightlies with it in about 2 weeks from now. There're quite a lot of changes in v1.13, backporting would be problematic.

I see, and thanks for sharing the ETA. I'm excited to check out the improvements when it arrives.