When a file is selected for upload it is queued for processing along with all other files that currently in process. Once the queue gets too long, we automatically start additional servers to handle the workload.
Uploads of premium plans are handled with a higher priority than the ones of free Woks. Uploads to premium plans therefore almost start instantly. Uploads to free Woks may need to wait a little bit for a processing slot.
The upload itself is done with the same speed.
Please note that in most cases, the upload speed is rather limited by the speed of the uploader's Internet connection (mobile data connection, wireless connection, cable connection) than the speed of CloudWok data transfer servers.