[Words Section] Reordering of words list is very intensive and freezes the tab.

[chrisjsimpson]

Very welcome snazzy new Words section whoo.

After completing a flashcard session the reordering / updating of word strength blocks the entire webpage from running / is very cycle intensive.

model name : Intel(R) Celeron(R) CPU B810 @ 1.60GHz
MemTotal: 6021392 kB
MemFree: 1021412 kB

Chrome Version 35.0.1916.153