parallel testCase execution by script

Hello,

i would be thankful for some tips how to write a custom parallel script for managing test case runs

Imagine I have a complex test suite where test cases are dependant on other. I run them one after the other at the moment, but would like to improve performence..

Would like to see if a script manager would not be better than full reorganization of all cases into separate Suites.

Example:
SUITE ("->" dependancy)
TestCase1->TetsCase7->TestCase8
TestCase6 / \TestCase9

TestCase2->TestCase5
TestCase3
TestCase4

(some standalone, some with simple dependancy, some with complex)

I have not wide knowledge about this topic yet, so what could be the solution:
1. several new testRunners?
2. running the test cases async on one testRunner?
3. how to handle "splits"? (as in example splitting testCase7 into two separate parallel paths)

IS this even possible?

Thanks.
J)