For me (latest Firefox beta, on Windows 7) your materialization effect animates at about 2Hz.
[EDITED to fix a stupid mistake: I wrote 0.5Hz but meant once per 0.5s, or 2Hz.]
[EDITED to fix a stupid mistake: I wrote 0.5Hz but meant once per 0.5s, or 2Hz.]
EDIT: ha, IE10/Win7 (in a VM) is super smooth for me. Still no idea what's going on with Firefox.