Hi Al
Are you by any chance checking
Publication Properties > General (2) > Miscellaneous Options: Use publication search database ?
This is the only way I know to produce the file ILMSrch.dll.
I've not experienced the presence of file ILMSrch.dll slowing down the loading of a published publication. Even with my biggest pubs, ILMSrch.dll has not exceed 50KB, so I suggest that something else is causing the slow loading issue.
Here's a tip I've found useful because I produce pubs that exceed 1000 pages, are exclusively text-based, and need to be searchable.
However, during development when I need to publish to check various issues, I find the continual production of file ILMSrch.dll annoying. This takes less than 2 minutes even for my biggest pubs, but I have a low tolerance for waiting around

. During development, I just uncheck the box mentioned above and turn it back on when I need it.
HTH