I've found that running it using the OpenGL mode can help with performance and graphical glitches. To do this just start the War Thunder Launcher, Then go to the "Toggle Advanced Settings" option (The little gear icon next to the graphics presets.) and at the bottom there should be a section called "Debug settings". Under this section there is a option called "Render". Click on the drop down menu to the right and select the "openGL (test)" option. Now just start War Thunder and it should be running a bit better.
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