Have you tried exporting to Image Ready? It does animations really well and compresses the file. Just load each image on a separate layer and it will sequence through them at whatever frame rate you need. It will also output an Alpha transparency channel if you need it. What file format do you eventually need this animation in? If you are doing GIF's, unless the resolution is very small, the file size will be massive and take forever to download. I suggest you go back to your client and tell him he should listen to people who know what they are talking about. (Thats why he employed you). Vectors are a far more web-friendly, lightweight format for web animation. You might want to also have a look at Swift3D from Electric Rain.