if it was added with the stock Edge driver (zigbee contact)… you can try using @Mariano_Colmenarejo Edge driver and see if there is an improvement (or not).
I will let you look through his listings and check the fingerprint to see if it is supported: https://community.smartthings.com/t/edge-driver-mc-zigbee-drivers-for-motion-open-close-moisture-smoke-co-sensors-and-others-devices/231689
It may be his Zigbee Contact Mc: Edge driver
but then again… anything I have posted has not improved your lag 