I have been modifying and testing throughput of our portable and TM equipment the last couple weeks. The wand fitting sizes, pressure and solution hose diameter can greatly affect flow. For example, I can get 1 quart more flow per minute from one portable at lower pressure vs my TM with the same wand just by using larger solution line. Also hooking up your pump inlet directly to the sink, washer connection, etc... instantly gives you 50+ psi increase with the wand keyed and an extra quart per minute of flow with zero modifications or jet changes.
With huge jets and higher flow I have also seen a 10-15° increase in temps to the wand hooked up directly to the sink. For example with my portable if I turn up the job site water heater as soon as I get there I can get a quart more flow per minute only 25-30° less in temperature than my TM. That is a big increase and cleaning speed goes way up. If you play around and take measurements I know you definitely can boost everything for very little money.