This in itself is not a bug that can be reported to be fixed like other issues. It is related to cache usage, browser, system specs, how long you have been in the game, how many tabs you have open, and at least a dozen other variables.
As we work on resolving other issues like in the memory leaks thread, and our continuing efforts to move away from Flash, I hope to see issues like this start to improve as well.
As the other related issues to this have been reported, I am going to set this one as reported as well, though it isn't reported specific to only partial graphics loading.