Map detail delays
I have this issue, as well. There have been a few times, in the past, this showed up, but it always eventually cleared up.
Same thing for me, mostly the mini map takes forever to load.
Since the Tower of Nightmares patch, it’s been taking forever (by which I mean as much as 10 seconds or longer) for detail of zones on the world map, and similarly my compass, to fill in. Prior to that, all I have is an unusable, blocky mess reminiscent of 8-bit graphics.
OK – I’d thought it might be a memory issue. It doesn’t seem to be.
I was running on 4Gb, and noticed it was getting tight with GW2 active, so I installed another 4Gb that I’d had sitting around for some time. GW2 probably was memory-constrained – with room to breathe, it seems to have a footprint on my machine of up to about 3.5Gb, including cached data, and other stuff was swallowing another couple of Gb – but even now it’s not, the problem persists. I just timed 18 seconds between emerging from Lion’s Arch into Divinity’s Reach and the main map becoming usable, for example.
The same happens for displaying the inventory in your bank, or your armor/weapons when displaying the hero screen. It sometimes happen when displaying your own inventory too.
So assume you want to swap to another weapon while running from one fight to the next. You can forget about it, because the contents of your inventory/armor/weapons doesn’t display Really? Yep.