Loading... known Blizz bug?

[Tonyleila]

For me some Tooltips are realy loading slow... sometimes they don't even load after minutes. Also if I look into Guild Professions its asking for information forever - most times reopen the window helps.
Short after login the first time of a day I can't open my profession window it sometimes needs 1 minute untill I can klick the button and open the window (I'm a recipe collector) and noticed twinks with low skill don't have that problem. If you have many recipes its loading slow. Some other ppl from my guild have the same problems.
I already asked a GM about the long loading times of my personal Professions in 5.1 and he said that thats an unknown problem - now in 5.2 they added this slow loading tooltips and Guildprofessions? Also If I disabled addons its the same problem :/

Before anyone asks my Internet speed is 24Mbps download so that can't be the problem.