Slow Restarts after Repairs or Updates?

Hi ,
New iMac ,all is reasonably well.
When I update or do a disk repair, the restarts are very slow ...about 3 minutes with the display staying on the blue screen for a long time .
I have read about the "enhancer bundles" but I don't think I have those(not a 100%) ...also there has been a suggestion that Norton might be an issue.
Thoughts
Raff

The RAM should be sufficient and was originally. All I can suggest is to review these:
Macintosh OS X Routine Maintenance
Mac OS X speed FAQ
Maintaining OS X

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