Alrighty...rolled back SP1
This has gotten rid of the slow initial client loading, the white screens when switching gates, and about 60-70% of the lag issues I was having.
I still noticed a bit of lag (a bit being more than what I was used to before) but I'm guessing this may just be "true lag". Anyhow, I'm much happier with the performance and would recommend *against* installing SP1 for Vista if you like to draw enjoyment from playing Fiesta.
Also, as an aside, I had to also turn off the automatic Windows update feature. Because I rolled back SP1 it will continue to detect the Vista needs an update and would otherwise continue to attempt to download and install it.
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