I noticed in the first building that if I'm halfway up the stairs and look around that I get weird lag spikes. It also happened after I died and exited the beginning truck and looked around. I'm using continuous movement and look.

On the SteamVR chart it shows some yellow spikes to 9.x ms, but as I'm using an original Rift, it is still under the 11ms needed for 90fps.

Can anyone help me or explain why I'm having these issues?