SH-S223Q Read Speed when ripping

I have a SH-S223Q Samsung burner with modded firmware (for faster read speed).

My question is:

When ripping a backup (dvd) will the read speed degrade as the speed goes up? If I rip a movie on full speed will it decrease the disc quality?

Thanks,
JOe K.

Sorry about the confusion on the above question:

When ripping a backup (dvd) will the quality degrade as the speed goes up? If I rip a movie on full speed will it decrease the disc quality?

Anyone?