The resync delay setting should take care of track starts getting cut off and it’s best to use it with Roon as there is a known issue in the current firmware for the dCS network card that causes the card to lock up when a mixed sample rate queue is played. Setting the delay helps to address the issue, but doesn’t correct the problem. This is being fixed by dCS and new firmware should be out shortly.
This is totally your call. Analysis is responsible for producing the dynamic range graph that shows up in the progress bar and will also make sure that you don’t have any corrupt tracks in your library. You can turn off background analysis and use “On Demand” (which analyzes the track immediately before playback) but this may result in a similar problem.
Another option would be to set background analysis to “Fast” when you aren’t listening and then turn it off completely before a listening session. This will help speed up the process. Analysis is a one-time operation so once Roon has made it through your entire library the process is over.
Having said that it’s been mentioned elsewhere on the forum that Roon is moving to a different method for calculating dynamic range (R128) and that means that 1.3 will likely need to re-scan your entire library again. Just FYI.
You have a larger library than I would typically recommend for running Roon on the Synology itself. It works, but you’re pushing the limits of what that Pentium CPU can handle. When 1.3 comes out you might want to invest in an Intel NUC and use the new Roon Core Kit functionality to handle core duties. This will give you a turn-key Roon server that can mount all of your music files from your NAS and it will have the power needed to handle a 100,000+ track library.