If ye' scroll yer mouse to the far right side of the page, a list of maps should appear revealin' how many members are in each map. Fluorite Plains currently has around 200-225 members when it can only support 300 total. Due to so many members bein' in said map, mayhaps that is what's causin' ye' to crash. I advise waitin' a bit before tryin' to enter the map again.
Ye' could also try changin' yer renderin' system.
To reduce any lag ye' may come across, ye' could also lower yer view distance and turn off the water reflection.
If ye' have any questions on how to do these (via changin' yer renderin' system and/or lowerin' yer view distance/turnin' off yer water reflection), feel free to ask if ye' know not already. I'll post some tutorials in a response as to how to do 'em.
Its nothing to do with you, its that Plains gets really crowded. So its most likely that the map is full.