Are you using the Chrome player? If so you might want to try the Firefox version. Chrome pulled a plugin required to run GUNSTRUCTION, so we actually had to deploy a completely different solution which is in it's infancy. We expect the Chrome WebGL player to catch up, but unfortunately we are at the mercy of the web developers, and the Unity engine (which we use for GUNSTRUCTION). We actually optimized some things with the 3.0 patch, and reduced total light sources, and simplified the main room. We're still working on things, and I apologize for the performance hit. Could I ask the specs of the machine you are running it on so I can get a bench mark? Thank you.

We're running Firefox 42.0 in house as well, and haven't experienced any issues. That being said, we have dedicated video cards. GUNSTRUCTION is pretty graphically intensive, and we recently updated to a newer version of Unity (the web based engine we run on). Have you tried using the "low res" option? Click on the link bellow the player in Firefox.

We had an issue with save guns going to the wrong save spots (we merged all the mobile and web saves so they are compatible across platforms). This should be fixed now, please let me know if you are still getting issues.