Video Upload Speed?

Good day all, I'm new here and have previously searched the forums for an answer prior to posting.  Our upload speeds to MS Stream appear to be significantly slower compared to other popular video hosting platforms. I don't think it's our internet connection because the uploads to YouTube, Wistia, Filemail are measurably faster - at least 4 to 5 times faster. I'd appreciate hearing back from other users to better understand the platform and help manage my team's expectations.

Thank you!