While on fast graphics do this command
/summon EnderDragon ~ ~ ~ {HealF:0}
Then look up and the Ender Dragon will die like usual but then when he creates the "Explosion-like" particles they continue to stick around
MC-68281
Fast Graphics VS. Ender Dragon
Resolved
Cannot Reproduce
0
Cannot Reproduce
Also, your graphics card does not meet the minimum system requirements.