I'm giving this a rest. I'll report to e-onsoftware my experiences. It hasn't been very fruitful. I haven't come-up with one-all solution.

Everyday I have ben running a XP-32 VueMark test after boot. Here are my scores in succession:

573, 636, 591, 557, 568, 555

My latest XP-64 VueMark scores:

604, 593, 602, 598, 625, 456

These scores in XP-64 are relatively consistent. If there's a bad render time, it's the first run of a shift (456). The best time comes at the end of the test runs (two hours of  test runs - 625).

My highest XP-64 score was 659.  The time did not repeat. My second highest score was 646.  These high scores dropped like a dead-weight on the next day.

So there's not much I can give to you in advice.  I have a screen-capture of my services in XP-64, if anyone's interested, but I'm not sure it's helpful.

Charles