Framerate drop whenever an ability is cast in-mission.

[Rerecrosz]

It seems that my frames drop from a stable 100-120 to around 24-32 whenever I or another squad member cast an ability in a mission. This seems to be the only thing so adversely affecting my frames in this way. I've tried messing with settings (mostly particle-related, but anything that's not an ability won't tank my frames.) I've installed the newest NVIDIA driver hotfix in case it was related to the CPU issue some were having, even though my CPU activity doesn't spike in any way when casting an ability, I've tried verifying Warframe's installation, no dice. This issue only started happening today, which is strange to me, since with the latest hotfix I was running smooth as usual.

Any help would be appreciated.