I am currently sculpting a mesh with 500,000 triangles; the object mode has very noticeable lag but sculpt mode is a silky smooth 60 fps. This is very unusual and I don't know why it is doing this. Fast navigate doesn't make any difference to object mode's frame rate.
I thought changing the view clip end to 50 and removing both the camera and lamp from the scene would speed things up but, while it did temporarily get me 60fps, when I clicked on the character the lag starts up again. When I click on an object such as a cube I get full frames but clicking back on the character slows things down.
Why is this happening and how can I speed up the FPS?