You are not alone, its a laggy mess since MT indroduced. I could write a book with everything that is laggy and what you need to do to make DCS kind of work
To run DCS, I need to do the minimum: reduce your Mouse refresh rate to 500mhz, remove half of your CPU Cores via affinity, and buy at least 32GB RAM and a Graphics Card with at least 12 GB RAM. Eveny my 4090 with 24gbvram is full loaded on some maps