Its really not a large enough forum that even with browser mode it should take that long if MySQL is tuned and not using an out of the box configuration (which is terrible). Even rust drives are plenty fast for imports when MySQL is tuned.
From the folks at Litespeed technologies:
Subject: Security update for lsquic and all LiteSpeed Server products!
Please make sure to update to the latest version. This is a security fix for a vulnerability that can be relatively easily exploited.
If you cannot upgrade your server at this...
This is a decade+ old myth that needs to die. Both Matt Cutts (Google's search liaison before 2015) and, more recently, John Mueller (current), have said in no uncertain terms that text to HTML ratio are not ranking factors. SEO companies (and tools) will present this non-issue to clients...
Maybe you could use the suggestion forum and getting enough upvotes for it to merit consideration.
From my own experience importing several hundred vBulletin forums, almost no one asks for me to import calendar data into one of the third party calendar add-ons.
You're generally not going to see larger hosting companies increase connections for a shared hosting platform. Every time the number of connections increases, so does the maximum memory requirements of MySQL, and this can lead to one site to monopolizing server resources.