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Absolutely one of the top 3 mods to the 800... 
Ok take OR_Seedmans advice here about the sprocket swap. I did it and love it.
Now as for speed on the 800, I have the sprocket swap as stated, and I will do it in Km because it is easier for me, I can run at about 68 mph (100 km) all day long and feel nothing and still have power to pass.
This summer through MT and ND I was running along at 75 mph (120 km) and once again it did not feel like the bike was working hard, you knew it was running hard but not over hard, it was with confidence. I ran at that speed for a couple of days and had no ill effects from it. It does depend on your weight and load, some times on a long steep hill I'll have to gear down but I have never had any issues keeping up with traffic and such at the legal speed limit, and a bit over.......
Try a couple of glugs of seafoam in your tank, and in the oil crank, then do your oil change and see if that makes a difference
change the sprockets to 18/38....lowers the rpm at 70 by quite a bit.....makes for a more comfortable ride....several posts on this forum on how to do it....
My 800 strains to get up to 70mph. Feels like it's maxed out at that speed. Am I just a big pussycat?
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