Need Help Optimizing Custom FlowField Pathfinding

Hello! I am currently working on things for my RTS project. And my current task is making Flowfield Pathfinding. The guidance used from the Astro RTS here

The system use the mixture of Hierarchy grid and Flowfield pathfinding.
My current issue is Flowfield Pathfinding as they’re not efficient enough when performing larger distances
Although current test is quite performance efficient when the starting point use only about 2-3 hierarchy grid.

10 Scattered Starting node.
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(how long the entire pathfinding process take (-debug visual around ~0.4s as they took performance as well.) : how many times the process have to calculate the nodes.)
The expectancy of the system normally should take only about <0.2 second (best case scenario)