I am getting fairly significant FPS loss using bandicam; even after lowering settings to 40% quality and using Nvidia encoding:

i7 920@3.8Ghz/12GB RAM/RTX 2080Ti 11GB; bandicam recorded on SATA SSD:

Cyberpunk 2077: 55.2 to 42 (24% FPS loss)
Gear of War 5: 67.7 to 56.6 (17% FPS loss)
Grand Theft Auto V: 47.95 to 39.973 (17% FPS loss)
Hitman 2 2018: 53.1 to 44.47 (17% FPS loss)
Metro Exodus: 57.83 to 50.42 (17% FPS loss)
Middle Earth: Shadow of Mordor: 123.35 to 90.41 (27% FPS loss)
Red Dead Redemption 2: 63.0712 to 49.2893 (12% FPS loss)
Strange Brigade: 145 to 110 (25% FPS loss)
Tomb Raider 2013: 80 to 62.3 (13% FPS loss)
Tomb Raider 2015 (ROTTR): 42.1 to 36.56 (14% FPS loss)
Tomb Raider 2018 (SOTTR): 49 to 41 (17% FPS loss)

i7 7800X@4.6Ghz/32GB RAM/GTX 1080Ti 11GB recorded on PCIx4 U.2. SSD:

Cyberpunk 2077: 37 to 30.5 (18% FPS loss)
Middle Earth: Shadow of Mordor: 111.37 to 82.71 (26% FPS loss)
Tomb Raider (2013): 67.5 to 56 (18% FPS loss)
Tomb Raider 2015: 43.5 to 30.98 (19% FPS loss)
Tomb Raider 2018 (SOTTR): 46 to 41 (11% FPS loss)