SONICWALL 5600 SITE TO SITE VPN SPEED ISSUE

I have a new SOnicwall 5600 with a Site to Site VPN set up. connection is good but speed terrible. Often speed for copying file bursts, then pauses, then bursts then pauses. Slow speeds. The other end where I connect to is very fast fiber, and my end, my speed tests are good, not alot of traffic at all.

I want ONLY expert in Sonicwall and VPN to take this job, I will hire you for an initial log in and assess with me via teamviewer.