When flying the DCS F-5E with a force feedback stick, the forces on the stick remain constant for a given displacement regardless of airspeed. This is inaccurate - the F-5E has an artificial feel system which should provide longitudinal (pitch) stick forces proportional to g. Increased airspeed results in more g for a given deflection - therefore stick forces should be higher at greater airspeeds.
Public-release unlimited distribution document linked below provides data on the F-5's longitudinal feel characteristics and loads, starting on page 151 (numbered in document as 122). Of particular note are the charts showing measured stick force per g at various speeds and configurations on 169-171 (numbered in document as 140-142).
https://apps.dtic.mil/sti/pdfs/AD0738625.pdf