A laptop will always struggle with DCS.
@Reflected's advice is just the right one to improve FPS. Regarding VR, if you have a quest 2 then use oculus tray tool and set supersampliing between 1.2 and 1.5 and PD in DCS at 1. If you have a Reverb G2 then steamVR resolution to slightly above the native resolution of the headset (like 3000x3000) ... This is around 70% setting for me but people get various recommended % depending on their systems. This will give you crisp cockpit without taxing too much. If still struggling then drop SuperSampling from these.