I haven’t experienced fps loss when the lights you mentioned are turned on. But it’s the ‘recognition’ lights that take around 6-7 fps away from the sim. Some have said that the lights in Carenado’s aircraft aren’t as optimized as they should normally be. May be we should let Carenado know about it: https://carenado.zendesk.com/hc/en-us
Also, a few things are now broken in this aircraft after the latest MS/Asobo update.
CDI bar on the HSI not correlating with the GPS. I have tried a few flights, and I can not get any deviation to show on it. So basically, HSI doesn’t sync with GPS when CDI set to GPS (even thought HSI featured in PA44 does has GPS marking inside HSI gauge). Plenty of people are having this same issue.
https://forums.flightsimulator.com/t/piper-pa44-seminole-basic-information/324561/191
Also the outer ring (where you have the degree numbers printed) of the Garmin CDI device (located to the left of the Turn indicator device) doesn’t move at all when you rotate the OBS knob. It’s almost as if it’s totally inop.
Another user has reported that “Carb heat on/off no change in revs, Magnetos on/off no change in revs” – @Gerardgeek
And I’ve seen another report where someone reported that ILS glideslope wasn’t working as expected.