I am working on the framerate issues and I can reproduce them.
Something triggers a software rendering fallback in the driver.
Forcing GLSL seems to work around things for me, but it does result
in lower performance and may not work for others.
To clarify, for anyone that has not made this setting in the Mac port of World of Tanks:
1. Launch World of Tanks but do not press Play in the patcher window
2. From the menu bar at the top of the screen choose “File-> Run Command…”
3. In the “Command:” entry type “regedit” without quotes
4. Click “Run”
5. In the Registry Editor navigate to:
HKEY_CURRENT_USER-> Software-> Wine
6. Right click to create a new Key and name it “Direct3D” without the quotes
7. Right click the new key "Direct3D" to create a new String Value and name it “UseGLSL” without the quotes
8. Set the value of “UseGLSL” to “enabled” without the quotes
9. Close the registry editor
10. Click “Play” to launch World of Tanks
This will change the path World of Tanks uses to render. Frames per second will not be the highest you have seen in-game but they should rise to a stable, playable level. The key only needs to be applied once, World of Tanks will save the key until you adjust it again.
When a fix is released, this key should be deleted to regain the highest frames per second available in World of Tanks.