Client Freezing on Control-Click

I'm having an odd issue and no idea what is causing it:

Control-clicking on an interface element (to ping cooldowns for example) causes my game to freeze, sometimes up to 5 seconds. Usually this happens only the first time per-round that I do so. Other times it is consistent, and use of the feature becomes suicidal.

I would love to know if anyone else has had this and if so what the solutions are?