Buy Managed Switch or cheep router with managed switch capabilities?

Right now I have a 1Gbit speed I have a Opensense box as router and then a old router with openwrt as a switch to a OpenWRT AP. My OpenWRT "switch" could mabye do the job its a D-Link DWR-116. I haven't played allot with the settings mabye I could turn off unessential stuff?

If I need to buy something new the performance criteria would be, that it can do 1Gbit speed in and split it in min 3-4, It needs to handel 3 VLANs. Where one port gets several VLAN in and out.

Thanks in Advanced