When you find any remove them immediately. For example, torrent downloading sites constantly upload some data to other users.
Step 4. Reduce Too Many Wifi Users
This is quite a common issue these days. Everybody in your home is glued to the Wifi and hence low speed. But using the same Wifi by many users slows down the Internet speed.
This is because using Wifi distributes the bandwidth to all the connected devices in range. Hence, we recommend you grant Wifi access to those devices only which is more required. Or you can limit the users to some extent.