YouTube painfully slow and choppy

1st gen 16gb WiFi.  YouTube playback is horrable.  Tried booting, resetting router, changing DNS servers, nothing seems to help the playback from stuttering or playback.  I am getting 9+ MB from speedtest at the iPad, sitting 2 feet from the router....

Well, project info:
1920 x 1080, 24fps, HDTV 1080 24 Preset.
One clip filmed with Nikon D800 (1080p@24), 16 seconds long
Added two shapes (very thin lines), one text, one  "Solid Layer" for vignetting, and then Nul for tracker which is for the lines and text.
All the Effects are in the videoclip: Sharpen, Levels, Broadcast Colors, SA Color Finesse 3, Unsharp Mask
I've used Numpad 0 almost all the time for preview. But is the space bar preview for previewing AFTER numpad 0 RAM-preview, because the RAM preview makes the green line over the composition. But if the most of the preview is done by NumPad 0, what's the meaning of the space button -preview in the After Effects when it seems to be a wrong way to preview.
Is there any way to improve this preview? More RAM, faster CPU?

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