The today's update (1.0.9) was switched from the main branch to beta because someone reported that the performance got worse after the update. I will try to figure it out tomorrow.
If anyone would like to test the new version on the beta branch I would be very interested if there were any performance issues.
PS. To switch to beta you need:
1. Right click on the Elven Assassin game in steam
2. Click "Properties"
3. Select the "BETA"
4. Select "beta" from the dropdown