Hi Jeremy,
On the slowness issue, it might be that you have a lot of things attempting to sync in for the first time, but that wouldn’t last for 2 weeks — unless it is the task redundancy that is keeping it in a sync-loop.
I’ve created sync-loops before, while experimenting with and testing the service. The first was while trying to find a creative way to forward reQall notes into Producteev to hack in reQall’s voice recognition — that was related to looping email forwards and the mail to task feature. I created another by accident with Google Tasks: I tried syncing multiple workspaces when it only works with one (see article above). I had to turn off the Tasks connection on all workspaces and then sort by the Gtasks list label and use the batch menu (check box pop-up) to select all and then delete.
If that doesn’t work for you, or has grown to some sort of astronomical task, contact their support. Judi is awesome and will definitely help you out. As it sounds like yours is a bit of an extreme case, you will probably get connected to Stephane or one of his crew and they should sort you out.
You shouldn’t have any trouble there, but if you do, let me know and I will broker an introduction.
Stick it out, man, it will be worth it in the end. :)