Things you can try to speed up iCloud:
How to increase your upload speed
So if you're a gamer, streamer or homeworker, a fast upload speed matters to you. The faster your upload speed, the clearer your calls and the sooner you're getting things done! Just like downloads, uploads are measured in megabits per second, or Mbps.
Ensure there are no other intensive network-related processes taking place - e.g. updating of iCloud Music Libraries, uploads/downloads from iCloud Drive, downloads from the Mac App Store etc. - the system will often prioritise certain actions over iCloud Photos which can slow things down a bit.
As you can see, there are many options by which you can configure the settings of Google Drive, but to work on increasing the upload speed on Google Drive, select Direct Connection below Proxy. Under Bandwidth settings, select Don't Limit for Download Rate as well as Upload Rate.
Generally, a good upload speed to shoot for is 5 Mbps. Asymmetric DSL (ADSL) usually has speeds up to 1.5 Mbps, while cable internet can have upload speeds from 5 Mbps to 50 Mbps. For most online activities, even ADSL's 1.5 Mbps is more than enough for a smooth internet experience.
What is a good upload speed? Generally, a good upload speed to shoot for is 5 Mbps. Asymmetric DSL (ADSL) usually has speeds up to 1.5 Mbps, while cable internet can have upload speeds from 5 Mbps to 50 Mbps. For most online activities, even ADSL's 1.5 Mbps is more than enough for a smooth internet experience.
10-25 Mbps – Ideal for moderate HD video streaming or online gaming and downloading files. Acceptable for several connected devices. 25-100 Mbps – Excellent for heavy HD video streaming or online gaming and downloading files. Acceptable for many connected devices.
Upload speed is the speed your Internet connection requires to send data from your device to another device or to the Internet. Upload speeds are pertinent for video chats, downloading large files, or live streaming video.
Download speeds are much more important than upload speeds for an average internet user as most of the activity you do depends on it. Streaming videos, for example, use download speeds, whereas upload speeds are only utilized when a user is uploading a photo to social media.
4. Check Network Settings. You can speed up the process of downloading messages from iCloud by checking your internet connection or network settings. Just go to iPhone "Settings"> "General"> "Reset", and then click the "Reset Network Settings" option.