That's a pretty hefty rip! The saw you used is like butchering a side of beef with an Xacto knife. Sure, it'll work eventually...
For big rips, I have an old 4 1/2 TPI Disston 27 1/2" (toe to heel on blade) ripsaw. Works great after I cleaned it up and filed it. You could probably get through a foot per minute with it without getting out of breath.
I've also used a 6 TPI Disston 26" rip. Worked very well on 5/4 SYP and 8/4 oak.
A good ripsaw is a power tool, and it won't burn out under load!
Steve, mostly hand tools. Click on my name above and click on "Visit Homepage" to see my woodworking blog.