BIG SUR 11.7.10 OR MONTEREY MAC MINI 2011

HI I AM USING MAC MINI 2011 8GB RAM 1TB SSD I AM ON MACOS BIGSUR 11.7.10. SHOULD I UPGRADE TO MONTEREY OR KEEP UISNG BIG SUR I DONT WANT ANY SECURITY PATCH OR NEWER APPS I AM HAPPY UISNG BIG SUR JUST NEDED SUGGESTION

IS THERE ANY SLOOWNES IN MONTEREY AS COMPARED TO BIG SUR AND SUGGEST ME WHICH MONTERY VERSION IS BEST 12.5 OR LATEST???