Recovery topic

I am rooted and have the latest twrp recovery, think it is 2.8.2. On this version, I am able to save my backup directly to ext sd. I have noticed however that when I do a backup, it takes between 30 to 40 minutes to do one. However, I just did a restore last night and it took over a hour and a half. I have only had the phone about 2 weeks. When I had my S3, doing backup would takes kess than 10 minutes, same with restores. Is this normal or is something amiss?? Thanks for the feedback.