Even at an absolute worst case it still beats the pants off Slack.
An earlier blog post shows this http://yeokhengmeng.com/2016/09/windows-for-workgroups-3-11-...
Wikipedia says "However, no single process can use more than 16 MB.". Not sure where is the source of that though.
https://en.wikipedia.org/wiki/Windows_3.1x
It’s a limitation from the 286 Protected Mode.