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-display X-server              Create GUI on X-server, not localhost
-geometry or --geometry WxH    Override window size settings
-geometry WxH+X+Y              Override window size and position
-O or
  --override-setting KEY=VALUE Force the setting named 'KEY' to value 'VALUE'
-v or --verbose debug-level    Use '-v help' for level info

Also, if you use a dif't theme painter (i.e., qt), it should speed up
(at least, it did in my case):
 -O ThemePainter=qt