The behavior you should see based on my working on it, is that the first chart should be rather slow, and the second and then on until you close it, should be faster. Not sure if you have that. The signing is weird as is the closing.
Each tab will be slow and the following tabs should be faster. Actually, even on a fast version you should experience that, but it would be more like 1.5 seconds first time you do a tab (like Recent Encounter, Demographics, etc.) then almost instant after.
Who knows with ePrescribe. I have seen it related to the amount of meds.
I would check your deleted items and make sure they aren't over 5,000 or so. I would delete them anyway. You may already have that as the default.
