Fix missing global chat, mission marker, partymember marker ect.
If you don't see your mission markers, global chat and party member markers, this is for you!
For me, this everytime fixes it.
Fly out 25 km away from any station [in space]. Stay at your pilots seat and Alt+F4.
Wait 30secs, relog and wait patiently till it loads in.
Voilà now you get all markers back and better performance.