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Did it do ok after SP2?...

Yes SP2 made a big difference.  I had to lower my scenery and autogen settings also.

The C-130X runs great, except in high autogen and dense scenery areas at low altitudes.
Like over large cities and large airports.  Frame rates drop to single digits, very jerky.

In rural areas and at over 10,000ft it runs fantastic with frame rates from 25-70 FPS.
My  FPS is set to unlimited.

Since I've lowered my FSX settings it runs a lot better.

But, having to reload it each time in order to get all systems to work is a great big pain
in the Butt.  I hope Captain Sim has a fix for that?