My high fps did get alot higher but on maps with heavy destructibles, especially when being broken it drops drastically. Not sure if this is a linux related issue but i have heard the same exact performance issue from other people on windows.
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You can bug report it here (just search a bit first so that you don’t report something that is already reported and known about): (Gaijin.net // Issues)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)
For performance based issues it’s a bit harder to report correctly, there are instructions for what files they need and how to get them both on the bug report site and in the guide.