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Is there much performance difference in ad blocking options?
(sh.itjust.works)
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this post was submitted on 30 Mar 2024
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Performance is usually pretty similar. I use AdGuard Home (mostly for malware blocking) and it stores the cache in RAM, so the only thing that's potentially slow is the first lookup for a domain. That's going to be affected by the size of your block list, but it's likely that all these solutions use hashing to speed it up, meaning it won't slow down linearly. Once a domain is cached, serving it is very fast. The others work similarly.
AdGuard Home has an option to serve a stale cached record and refresh it in the background, meaning DNS lookups will practically always be served from RAM, except after you restart it when the RAM cache is empty.
I also like AdGuard Home because it supports DNS over HTTPS and DNS over TLS, and uses it by default. There's also a separate piece of software called AdGuardHome-Sync to keep the config in sync between multiple instances. I run two of them (one on a home server in Docker, and one on a Raspberry Pi in Docker) so I can take one down without breaking the internet for my wife.
I'll have to look in to that. I really need to look into redundancy for a lot of things actually.
Redundancy is really important when it effects other people, IMO. Personally I use 2 piholes kept in sync with gravity-sync.
DNS is one of the easiest things to make redundant, since each server runs independently of the others, and clients automatically handle falling back to the other server in case one of them is down (modern OSes will send around half the queries to the primary server and half to the secondary, but they handle outages well too)