It ain't vBulletin causing the problems, especially with one not modded, like yours.

You can see from the tests you don't have a massive amount of calls, and you don't have a massive amount of server or processor load. You don't even have many third party elements that could slow you down.

Your host is just using the default "you need to upgrade" nonsense. Because that's the script they have been given. Most of them aren't qualified to work at McDonald's much less as "tech support" for a hosting company.

Where did that LIKE icon come from? A plugin?
Same for that flashing envelope when I have a new PM... is that a plugin too?

Kinda neat to see new features and not have to code them myself like I have had to do for 14 years :)

Yes they can both be achieved with mods, that can be found on here. There is a whole bunch of them that handle things differently. Best bet is to search for them, and try them out.