NavMesh does not update fast enough
I am making an RTS game where each unit is a character. The
Red color of navmesh tiles persist for a short time after rebuild has finished. However, navmesh rebuilds are still expensive and you should avoid forcing them constantly when characters are moving around. Additionally each rebuild affects currently followed paths - invalidated and recalculated if they happen to lead through modified tiles (which is your case).
Have you tried using built in avoidance for characters? There are two different ways of enabling it:
answered Jan 21 '15 at 08:14 AM
Follow this question
Once you sign in you will be able to subscribe for any updates here