I don't know about that "takes too much time" one, but as for the previous one I replied to, it should be safe enough to ignore, as it's just the client trying to set the engine's RPM on the damage panel, but as the damage panel you selected doesn't support it or has a feature to remove the spam, it'll post that error in the log. Shouldn't cause a crash though.
If you want to try and rule the engine RPM error out, you can try using Shtys damage panel for some games - that one has a fix that removes the error messages.