Problems with arrow movement

[v3Bu]

Here's my attempt to make arrow movement..

I need to know how can I make the arrow movement not to be bound in 1 unit, but a unit I select. So I could change units, but keep the arrow movement. How can I do this?

Then I want to ask you how can I improve this arrow movement? How to make it less laggy and so on?

[Dr Super Good]

You can not make the arrows less laggy, the lag is hard coded.

[v3Bu]

well using less triggers make it less laggy I guess, (have read). could someone show me how to, Mayby do the changes into my map and send it here, that would help alot. If you prefer jass thats ok too.