It could be a lot of things. Make sure your system meets the minimum system requirements, make sure your comp is set to one of the standard frame size and frame rate presets (custom comp settings are only for experts), and try setting the expansion and density to a smaller value.
If your version of AE is current and you still have problems we need a complete workflow description and system specs.
Custom frame sizes are only for experts in video formats and compression technology. 1000 X 1100 does not conform to any standard and if the video is sent to any streaming service it will be cropped or played back with black borders. I think it's probably hardware acceleration that is causing the problem. I still have no idea what kind of source footage you are using.
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