Is there a way to tell how long OW has been running?
 

I would like to be able to report that some of the slowness I was having in previous SP's is gone, but I keep forgetting how long ago it was I restarted OW.

Try running this command in the Terminal:

ps gux | grep OmniWeb

The 9th column should show you when OmniWeb started.

It does, thank you. Unfortunately, 36 minutes ago OW started grinding to a halt again and I had to force-quit and relaunch.