Slideouts on household current

I currently have my TT parked at my house, but have no way to hook it up to 30/50 amp service, so I'm doing the whole necked-down adapter to a 100 ft. heavy-duty extension cord. This works fine for using the lights and stuff as I do some work, but the slideouts certainly don't like it. I have a Sprinter 33bh, with one super-slide and a smaller one in the bunkhouse in the back. The superslide actually does better than the small one. It just goes really, really, slow but at least is tracking straight and even. The smaller slide kind of jerks and bounces a bit, and I can't get the bottom edge to go out all the way. There is about an inch and a half difference if you measure the top to the bottom. A slight amount of difference from side to side. Is this just a symptom of not having enough juice to get it done? Anytime we've been camping both slides work perfectly on 30/50 amp. Guess I can't remember the last time I had it hooked up this way or if something has gone wrong.