Thread:Project:Support desk/MediaWiki is SUPER slow to the point it's unusable?

I upgraded almost a year ago and didn't think much of it until recently. I upgraded from MediaWiki 1.9 to 1.19. It either loads at a decent speed or takes forever to load. I have searched and searched, yet found no solution. It never used to be this slow until I upgraded it. If anyone could help me fix this it would be great and the wiki users would appreciate it. Thank you.