The issue should not be with Oxide, there were no changes to how plugins work in the update. The only changes that would affect plugins is the Rust update, which you would be downgrading when using the previous version of Oxide.

As mentioned previously, these are the only changes on Oxide's side:
https://umod.org/community/rust/21467-high-memory-usage-and-hook-warnings?page=1#post-13

If you are having performance issues with the latest update, it would be from a Rust change, a plugin affected by a Rust change, or general server performance issues; not Oxide.

I had this same issue, but now my servers randomly freeze or crash without memory leaks. Anyone else expeiencing this now? I'm onRust build 5/18 @2:51:54 and Oxide v2.0.4589.

Do you have any plugins installed lightning?

I have a rust server with 32GB Ram and since 2 days ago it keeps using more and more RAM i needed to stop it because it was using 22GB of my ram i dont think it is normal because it was fine 3 days ago

Can some one help me?

LaunchStite remove all your plugins and see what happens.

Okay  including oxide?

no keep oxide, just remove your plugins

I've unloaded all plugin and it's same for me.... hight memory and after few minutes, server crash.... +12GB memory used...

only a downgrade for oxide helped me > 4589 to 4582

I cant seem to find the down graded version for oxide windows can u link it please

Are all of you running Windows servers?

Yes we are

Yes Wulf windows 10 pro x64

Are the servers behind NATs/routers, and is +server.ip set to anything other than 0.0.0.0?

RustDedicated.exe -batchmode -nographics  ^
+rcon.ip MyIPWan ^
+rcon.port 29135 ^
+server.ip MyIPWan ^
+server.port 29130