Police will boost night patrols in Tarneit, in Melbourne's west, in response to increasing anger among residents who are alarmed at the noise and disruption caused by large numbers of youths using a local McDonalds as a meeting point.

Residents are angry and say they feel intimated by the sheer number of youths who have met up and brawled in the suburb in recent weeks.

On Sunday night, there was a brawl at a McDonald's in Derrimut Road, in Tarneit, between a group of about 100 to 150 youths. Investigators were called to nearby Pistachia Drive about 9.40pm on Sunday where they were able to break up the group.

Police are now investigating the second incident in as many weeks at the same McDonalds outlet - the first one involved 40 youths harassing staff and attacking customers.