I'm sorry to hear you are having issues with the speed of your movie downloads.
It would be helpful to know what your download speed currently is.
The link below will provide a few troubleshooting steps that you can try improve the download speed:
...You can also try the following steps to troubleshoot the download issue.
- Restart your computer or device.
- Check for updates for your Mac or PC and install any software updates. Also, check for and install updates for any security software you may have (anti-virus, anti-malware, firewall, and so on).
- If using Wi-Fi for Internet access, try using a different Wi-Fi network when downloading. If you are connecting to a home network, try restarting your Wi-Fi router. Also, check for and install any firmware updates for your Wi-Fi router. (Refer the manufacturer's website for your router to get information on updating its firmware).
- If you are on a computer, try using an ethernet cable for wired Internet access instead of using Wi-Fi.
- Open iTunes.
- Choose Store > Check for Available Downloads.
- Enter your account name and password.
- Click the "Check Downloads" button.
- Click the Resume or Resume All button, or the resume arrow to resume the download.
I hope this information helps ....
Have a great day!
This May not be bullseye on your situation but you may make useful of my discovery. Odd as it seems out front, movies and just about any media will download from the iTunes Store much faster directly to your iOS device than it will through iTunes. In fact you can download it to your device then back it up to iTunes and have it there more quickly than it takes iTunes to do it directly.*
My only guess as to why this may be is that iTunes throttles back both in bandwidth and memory usage because of all of the processes a computer has running it the background, that and iTunes is probably recording info, generating thumbnails, making coffee and who knows what the alien bred bully of a program is doing, especially on a windows pc where it always seems to be smiling at you while making you feel stupid.... But I digress.
*this is based on my experiences on a few Windows machines over the last few years, using a high speed DSL connection via century old AT&T wiring.
if windows then CTRL + ALT + Delete > Task Manager
in Task Manager click on Processes > find iTunes.exe (Quick way just press "i" on keyboard then you have it)
then right click > Set Priority > HIGH
*NOTE : Do not put REALTIME or your computer + network will NOT be Stabled
This Might increse Speed from %15 to %20