Check your render settings. Mine is always smaller than the source files, but still too large to upload to YT with my crappy connection (welcome to the Philippines ha ha). I use AVS editor to shrink it down. It cuts my Power Director render down to 1/3 of the original render size, with no visible or audible loss. My latest project was 12 minutes, a render size of 1.3 Gb with Power Director, after running it through AVS it is 415 Mb. Still 1280x720 HD