Bug - Initial performance lag on level load, Alt-tab seems to resolve it

System:
AMD FX-6300
EVGA GTX 760 2GB
16GB RAM

Repro:

  1. Launch HW:R, choose to launch Homeworld Remastered
  2. Load a campaign mission (or multiplayer map)
  3. Once loaded, move the camera around, especially around the background light source
  4. Alt-tab to the desktop, then resume the game
  5. Repeat step 3

Result:

In step 3, theres a lot of lag present. Particularly around the light sources. Once I alt-tab and then resume the game, most, if not all of, the lag is gone.

Expected Result:

Optimum performance should be in use when the level loads. An alt-tab should not be required.