FSX-MS Just Flight DC-8 lag in high end laptop

[Lockheed L-1011-1 6]

hello, I got the complete pack of Just Flight's DC-8, including the liveries, but the game lags on my pc. my pc specs are: GTX 960M, i7-5500u (not overclocked, stock) 16GB ram, 512gb ssd. I am using old version (non-updated) of windows 10. any other aircraft including payware runs fine. I am playing on near highest without any traffic. any plane is above 40fps. but the Just Flight's DC-8 lags on the ground, and sometimes the outside lags, but sometimes the inside lags. I do not find a reason why the plane should lag, I can provide my fsx settings and add-ons. the plane lags mostly on the ground, but in the air it is fine. it almost makes impossible to land. please tell me how to fix this. thank you.

[Luis Hernandez 570]

There should be two models (at least in the Steam version): the standard and the HD one. Have you tried flying the standard ones?

[Lockheed L-1011-1 6]

3 hours ago, Luis Hernandez said:

There should be two models (at least in the Steam version): the standard and the HD one. Have you tried flying the standard ones?

there is no standart and HD model, only 1 model.

[Luis Hernandez 570]

Then check your texture sizes. If possible, resize the one bigger than 1024 to this size. All textures should be mipped.

PS: I had a similar laptop, but with a faster CPU... that's how I manged to run the DC8.

[Lockheed L-1011-1 6]

there is also general lag, where the plane hits 60fps but drops to 20fps on high end airport with high end aircraft, any other game runs nice.

[Lockheed L-1011-1 6]

2 hours ago, Luis Hernandez said:

Then check your texture sizes. If possible, resize the one bigger than 1024 to this size. All textures should be mipped.

PS: I had a similar laptop, but with a faster CPU... that's how I manged to run the DC8.

I am playing on full screen 1024 x 768 (lowest full screen resolution)

[Lockheed L-1011-1 6]

2 hours ago, Luis Hernandez said:

Then check your texture sizes. If possible, resize the one bigger than 1024 to this size. All textures should be mipped.

PS: I had a similar laptop, but with a faster CPU... that's how I manged to run the DC8.

thank you so much, I increased the resolution and it runs a lot better now.

[Lockheed L-1011-1 6]

I turned off every setting one by one, I turned off shadows for the DC-8 which worked.

[Lockheed L-1011-1 6]

bruh. it is still lagging. my PC is 4x time the needed specs and I cannot handle it.

[W2DR 1,860]

I know it's not what you want to hear but the answer is probably that the CPU/GPU combination is just too slow to handle the complexity of the aircraft. 

[Lockheed L-1011-1 6]

4 hours ago, W2DR said:

I know it's not what you want to hear but the answer is probably that the CPU/GPU combination is just too slow to handle the complexity of the aircraft. 

I do not think that since this is the most laggiest aircraft in my library. I have also lowered settings but no dice. there must be a bug, sometimes it reaches 70fps for less than a second but mostly below 20fps. I do not think the aircraft is intense enough not o handle it. CLS DC-10 has nearly the same specs and I run at 60fps with REX.

[W2DR 1,860]

It may not be a bug though. Nor the complexity of the entire aircraft. Sometimes just one or two unique features can cause this type of problem. I hope you find a solution as I know this kind of stuff is maddening.

[Lockheed L-1011-1 6]

so I did 20 minutes of testing with the DC-8. I took off with an another aircraft at KEDW. after some minutes later, I changed to DC-8. I lowered my settings to test if it had anything to do with settings. I lowered them all (res was 1024 x 768) and nothing really changed. I turned the settings back to high, nothing still changed. I was getting 30-40fps middle of the desert, but you see, it is middle of the desert with only some branches as objects. the fps varied mostly between 25-40fps. I also played with the engine throttles if there was change (the DC-8 has smokey engines) sometimes plane with smokey engines make it run horribly. still no change. I do believe it is optimized badly.  I was playing with 1024 x 768 the whole time.
thanks

[Lockheed L-1011-1 6]

1 minute ago, Lockheed L-1011-1 said:

so I did 20 minutes of testing with the DC-8. I took off with an another aircraft at KEDW. after some minutes later, I changed to DC-8. I lowered my settings to test if it had anything to do with settings. I lowered them all (res was 1024 x 768) and nothing really changed. I turned the settings back to high, nothing still changed. I was getting 30-40fps middle of the desert, but you see, it is middle of the desert with only some branches as objects. the fps varied mostly between 25-40fps. I also played with the engine throttles if there was change (the DC-8 has smokey engines) sometimes plane with smokey engines make it run horribly. still no change. I do believe it is optimized badly.  I was playing with 1024 x 768 the whole time.
thanks

mostly it was 40fps (my fps limiter is set to 40) but there is this sudden drop for a second to 19-23fps, this is not only for DC-8, some other planes in my library. also help me configure DC-8's alt select, I still cannot do it. it is always at "00000"

[TextRich 88]

On 12/17/2020 at 4:28 PM, Lockheed L-1011-1 said:

bruh. it is still lagging. my PC is 4x time the needed specs and I cannot handle it.

I don't have the product, but I am very curious as to the exact specs of your PC.  Recommended specs for default FSX aircraft is one thing and very intensive add-ons are a different story.