This board changed to "Local Mode" which doesn't work across domains or allow you to use html in your ads, images only.
There is also another "Remote Invocation" that you can turn on, I think it uses PHP, but again images only, no html.
I use "Remote Invocation for JavaScript" but I keep my spots to 4 or less a page so I've never seen a lot of slowdown. I guess a lot has to do with what browser you use and what platform. I actually never really thought it was that slow when the board used "Remote Invocation for JavaScript" but a lot of people found it painfully slow.
There are also some other options that you can turn on under "Settings" --> "Invocation and delivery settings"
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