Halt Location : 422 (CoS Bug)

Sup guys, I got this error while playing single player assassin and realised it was linked to using CoS against ennemies (particularly the Ancients).

I have been able to avoid using CoS to clear the Ancients, but it seems my frame rate has dropped significally since then (15-24).

It gets even worse when my minimap is active, rendering the game completely unplayable.

Any ideas?

Thanks