If your upload speeds are slower than your expectations then there may be a problem with your internet service connection. Just visit testmyinternetspeed.org to run the internet speed test and see that at what speed is your connection running. Generally, you need your internet connection to deliver at least 1-2Mbps upload speed to make sure that smooth file transfer takes place.
Check with your Internet Service Provider: If your connection speed isn’t as strong as your ISP’s internet Plan, then in such cases please reach out to your Internet service provider and ask them to look after the problem or verify if their connection is working properly.
Switch to Ethernet cable from wifi connection: One more factor that may lead to slow upload speeds is while you are on a wireless connection. Wifi connections are expected to have few glitches in the connection that may cause the upload speed to become slow. And in this case, we may switch over to a wired connection.
Restart your computer and also get the Java version updated to the latest one: Check the version of Java and get it updated to the latest release. Also, restart your computer because sometimes certain issues may prevent java from functioning well and in such cases, the restart may resolve the problem. Ensure that you drag and drop the applet while you attempt to upload again on restarting the computer.
Try to use a different computer or browser: Sometimes you may find that the upload speed increases on the alternative browser. In such cases make sure that your web browser is of the latest version be it any i.e. chrome, firefox, safari or internet explorer. Even after updating the browser if our upload speed doesn’t improve then, try seeking the help of a different computer to get through the issue. I on the other computer you get higher upload speed then that means there was an issue with your device itself that leads to a slower speed. And if the reverse happens then most probably the issue lies with your internet connection.