I have finally found what made my OmniWeb (and some other apps) so instable. Speed Downloads Input Manager.
The code of the items in the folder /Library/InputManagers/ will be injected into every single running app on your system, which essentially is a very bad idea.
SIMBL is trying to be a bit more selective there, but I find it still being loaded by OmniWeb and other apps and it makes many apps instable, so I ditched all the Safari Hacks and Add-ons, removed SIMBL, and also disabled the automatic download through Speed Download (which essentially will remove the InputManager of SD). And suddenly OW runs much more stable and consumes far less CPU.
The code of the items in the folder /Library/InputManagers/ will be injected into every single running app on your system, which essentially is a very bad idea.
SIMBL is trying to be a bit more selective there, but I find it still being loaded by OmniWeb and other apps and it makes many apps instable, so I ditched all the Safari Hacks and Add-ons, removed SIMBL, and also disabled the automatic download through Speed Download (which essentially will remove the InputManager of SD). And suddenly OW runs much more stable and consumes far less CPU.