Unfortunately most forum systems, whether this is IPB of VB both forum systems have a server limit rating. Meaning, if the server gets to busy at a certain time, it will shut off the databases in the forum temporarily to allow the server to "cool down". This way you don't risk server crashes and actual downtime. Cannabis.com is filled with resource intensive applications, as well as quite a large number of visitors so put 2 + 2 together and a little server lag can be expected some time.