How to speed ​​up a single hhvm shell for some functional tests? #8938

Hello, I want to test a lot of hack functions through ./hhvm test.hack.

I don't need hhvm server, I just want to test from the shell.

But the startup of hhvm is very slow, it takes about one second to test one.
Because I have a lot of hack files to test, this speed is unacceptable :(

How can I speed up the startup of a single hhvm shell?
Or how can I get a hhvm with only terminal shell and no other functions?