See
https://vborg.vbsupport.ru/showthrea...223#post262223
Anyone seriously considering hosting their own forum using vBulletin and including a spell check solution is going to either have to 1.) pay for someone else's server, such as spellchecker.net, or 2.) host a solution on their own server. Your server simply cannot (regardless of system stats) host spell checking solutions for even a fraction of all vBulletin users. This might be a fine solution for a handful of small club sites with less than 100 registered users and no more than 2 or 3 users on the site at a time. Any more than that will cripple your personal server and eventually lead to you discontinuing the service.