If you need the database to quickly open, you need to make sure that the views are always indexed and up-to-date.
The server discards any view-indexes if they haven't been opened for a while, or it needs to increment updates to them if they haven't been used for a while.
You could create a server PROGRAM document and schedule this task to run:
UPDALL imtchatlog4.nsf -v
(the -v option updates the view indexes). For details on what options are available, type
> load updall /?
on your server console.
If you schedule a program doc to run this task periodically, the views will always be up-to-date and the db opens immediately.