If you use DSL to connect to the internet, don’t stream in HD

The DSL technology has a maximum upload limit of 1 Mbps, which is equivalent to 1000 kbps/second or 125 kB/second.

With this upload speed, it is not feasible to broadcast in HD. The highest resolution that your internet upload speed can support is 640×480. In this scenario, Stripchat recommends configuring a video bit rate of 800 kbps for 640×480, considering that some bandwidth is required for the audio. For the audio, Stripchat suggests setting a bit rate of 128 kbps. Therefore, the total bit rate required for your broadcast would be 800+128 = 928 kbps/second.

https://wiki.stripchat.com/How_to_use_OBS_studio#Output_setup

In conclusion, if you use a DSL connection, you must use a 640×480 resolution with your audio. It would be pointless to buy a 1080p HD webcam since your internet speed wouldn’t support it effectively.

This means you can only broadcast on one website at a time due to limited bandwidth. Additionally, always use an internet cable instead of Wi-Fi and close all other applications when broadcasting.

There is one alternative that is faster than DSL: VDSL. VDSL or G.fast is significantly faster than ADSL or ADSL2. In fact, nearly all other technologies are faster than DSL and DSL2.