Simple AI imported shapes very slow, is there a way to merge and convert?

Hi,
I have been using a very simple method of drawing my basic shapes in Illustrator and importing them into TB. It works great, it imports everything as vectors, but with multiple drawing objects on the same layer. Is there a way to merge these into one drawing object that will run more smoothly? It runs very slowly. I don’t need each object to be vectorized even, just one drawing object.

Any other advice on how to make drawing objects less taxing on the processor would be great, thanks in advance!