Forums are a bit slow, yes. I agree with the suggestions above of implementing caching and compression.
That said there are some very slick features and the design is solid. If there’s one thing I could point to that really chaps my arse, it’s the search which as others have pointed out is pretty useless.
For it to be useful MINIMUM you need to be able to sort results by date.
In general though the results should be more compact and easier to scroll through. There’s too much wasted space on the page and it makes going through results even more difficult.
I end up using Google with “site:elektronauts.com” for better results and filtering options.