Game crash/lag issues in proximity to glitched water/lava

When in proximity to water or lava that does not disappear with the removal of the source block, game runs in slow motion, freezes, and crashes. Rejoining world causes items broken prior to the crash to duplicate. Removal of glitched water/lava gradually improves performance and and reduces risk of crash. Issue is evident in overworld and nether. Crashes can often prevent entry into the world.