I havent noticed that particular issue.I have the devil of a time typing because I cant put my fingers on the right keys and I cant easily see the information line inworld. All of the info boxes are a bit difficult to use in the normal way as they are quite far off the normal line of sight and I have to put them in the middle of the pic to see them. The worst is the bar at the bottom of the screen which ends up somehow in almost the middle of the scene.
I may be able to fix some of this.
Have you tried closing down external viewers such as google etc and also try turning off the music inworld and out. If you have running scripts on your avi, try removing some of them. In other words, throw out the baggage and see if it helps. It might even be your malware and/or other apps filtering everything.
When I close Kaspersky, for example, I find that I have anywhere from 10 to 30 other lines open. I have no idea what this means, other than stuff is happening even though I dont know it. Sometimes I exit them one at a time to see if it helps. The result is usually no change. Your might be different. You can always put an exclusion in the malware for SecondLife, I think.
Also, and this is true in or out of OR, cut your draw distance way back to the 300s or at least the 400s. This really gives your computer a break in the amount of work it is doing and almost always affects you very little as most of what you are interested in is within that range.
Good luck to you and me both! Let me know how it goes....