Why do emails on my Macbook Air take longer than they do to appear on the server site?

When I send or receive an email by clicking on the email icon at the bottom of the screen, it often takes longer to be sent or be received than if I go directly into the internet email site where it appears immediately.  At times, some people to whom I have sent emails do not receive them until hours later and conversely, incoming emails appear on the internet email site soon than they appear on my computer.  Can this be remedied?

Do you use Navionics for marine a marine chart plotter?  I noticed that after I installed all their (lousy) software on my MPB, this Navservice app would start up each time I booted.   It took me a while, but I tracked it down to the "LaunchAgents" folder in my system library.   Siince I quit the app each and every time I boot my MBP, I decided I didn't need it so I simply renamed the file from "com.apple.NavService.plist" to "com.apple.NavService.plist.old" and rebooted my MBP.  Voila, no more NavService app running in the background. 
As far as the purpose of this thing, the plist entry is launching the following app:
/Applications/Navionics World/NavService.app/Contents/MacOS/NavService
Take a look and see if you have the same thing. 
The Navionics software for the Mac is obviously written by someone that doesnt' understand how Macs really work, and they scattered junk all over the place with their install routines.  In fact, if you update the software it will place redundant copies in redundant folders, etc. making it impossible to know which versions are the latest, etc.

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