Hello, i am using ubuntu 14.04 with gtx 750 Ti (latest nvidia drivers) and i am experiencing problem with a rulers. When i add a single ruler wireframesketcher becomes very slow and unresponsive, but if i delete all rulers slowness are gone.

Hi Alexander,

It's the first time I hear about this problem. Can you email me your log file as generated using Help > Report a Bug? Thanks!

Hello, i already sent you a bug report.