Fallout 4

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Slow motion issue (SOLVED)
My fps is kinda low with all these mods Im running about 45 fps but why does the game go into slow motion because of it? Then when I look to sky and get 60 the game speeds back up to normal motion again. Does anyone know why?

Solved due to removing the iFPSClamp= line in my custom ini.
Last edited by RetroTekGuy; Jul 8, 2017 @ 6:25am
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Showing 1-13 of 13 comments
Ceejay Jul 8, 2017 @ 5:16am 
Do you mean when you look up into the sky you get 60, then when you look normal it slows down? or do you mean the game goes slow, so you look up then back down and your still going fast?

If its the first, well obviously its having to do less work to render the sky, thus speeds up and when looking normally it is having to do more so slows down.

If its the 2nd, whats more likely happening is the game is being bogged down by what it is rendering and remembering the odd thing where you have been(so if you go back its already there essentiall), looking up kind of refreshes the render as you are rending nothing then going back to re-rendering the lancape, almost fresh as it were, you kind of empty the buffer a little.
Last edited by Ceejay; Jul 8, 2017 @ 5:21am
RetroTekGuy Jul 8, 2017 @ 5:19am 
....Thats not what Im asking tho. I know why my FPS is better looking at the sky...Did you read my post? Or just bits of it. My game, Slows down the lower my fps goes. I dont mean just low fps performance I mean literally the game runs in slow motion, Animations sounds everything. Now the reason Im asking is my mate gets low fps to but his game doesn't slow down it just gets choppy.
Ceejay Jul 8, 2017 @ 5:24am 
Originally posted by Dr Quin Magna:
....Thats not what Im asking tho. I know why my FPS is better looking at the sky...Did you read my post? Or just bits of it. My game, Slows down the lower my fps goes. I dont mean just low fps performance I mean literally the game runs in slow motion, Animations sounds everything. Now the reason Im asking is my mate gets low fps to but his game doesn't slow down it just gets choppy.

Did you read your post? That is not quite how you described your problem initially. Which is Why I was asking the questions...well Im out, cannot be arsed when people do not decribe thier issues properly, then get cheeky when people are simply trying to ascertain what they are talking about.
RetroTekGuy Jul 8, 2017 @ 5:32am 
I described the issue correctly, You just focused on the wrong thing. I used the sky reference to illustrate the fact that when the fps is high the game runs normal, When its low it runs in slow motion. Your fault not mine. But I fixed the issue. iFPSClamp=60 was in my .ini, This is something that causes issues, I removed it and thus removed the problem.

Also....Im glad you edited your original comment to include actual questions and information. Much better than the original one.
pedantic_roc Jul 8, 2017 @ 6:15am 
You probably have your game 'clamped' to your refresh rate and the game is continually trying to catch up with itself. Have you checked that vsynch is off? Simple with nVidia control panel but with AMD you need to alter all the games' .ini files. Change iPresentInterval=1 to 0
Yonaga Jul 8, 2017 @ 6:17am 
The gamespeed depends on the fps. That is also the reason why the game physics screws up if it gets a higher amount of fps.
pedantic_roc Jul 8, 2017 @ 6:20am 
Originally posted by Kiara:
The gamespeed depends on the fps. That is also the reason why the game physics screws up if it gets a higher amount of fps.

You're right of course, Kiara. But I don't think the OP is going to run into that issue while averaging +/- 45 fps. :-)
RetroTekGuy Jul 8, 2017 @ 6:22am 
Yes hi guys all good, Fixed it. It was the iFPSClamp in my ini, Basically its an fps clamp to reduce stuttering but only works when you can hold a steady fps, And since I installed this new modpack my fps was dropping so it was capping the engine speed to that clamp. Removed it and all is well.
pedantic_roc Jul 8, 2017 @ 6:24am 
Good to hear, Dr. Might be kind of you to edit your post to include [Solved} at the end of the title so that others might also benefit from it. Have a great game. :-)
RetroTekGuy Jul 8, 2017 @ 6:24am 
Ah yes! good idea shall do!
Augoeides Aug 23, 2023 @ 10:30am 
Originally posted by RetroTekGuyAU:
when the fps is high the game runs normal, When its low it runs in slow motion. Your fault not mine. But I fixed the issue. iFPSClamp=60 was in my .ini, This is something that causes issues, I removed it and thus removed the problem.
I know this is a super old post, but thank you a thousand times! This solved my own issues, specifically around the Goodneighbor/Boston area, and probably a couple others, where I was experiencing significant slowdown when my FPS would suddenly drop to 30 FPS, but run the game in slow motion.

I haven't played FO4 in like 7 years, and was surprised when it ran weirdly (the game would flicker, which I eventually figured out was tied to needing MotionBlur ON). I had put iFPSClamp=60 in my Fallout4.ini file as a way to fix this issue, and left it there, because it didn't seem to be harming anything.

Flash forward nearly 100 play hours later, and I was noticing problems, that I thought was a modding issue, but turns out it was just this small line of code, that I put myself, lol. So yeah, thanks a lot! The game still runs at 45 FPS in these areas, but it's better than being permanently stuck in bullet time until I leave these places (which could take 10 minutes at times, due to the slow down).
RetroTekGuy Aug 23, 2023 @ 7:03pm 
Originally posted by Augoeides:
Originally posted by RetroTekGuyAU:
when the fps is high the game runs normal, When its low it runs in slow motion. Your fault not mine. But I fixed the issue. iFPSClamp=60 was in my .ini, This is something that causes issues, I removed it and thus removed the problem.
I know this is a super old post, but thank you a thousand times! This solved my own issues, specifically around the Goodneighbor/Boston area, and probably a couple others, where I was experiencing significant slowdown when my FPS would suddenly drop to 30 FPS, but run the game in slow motion.

I haven't played FO4 in like 7 years, and was surprised when it ran weirdly (the game would flicker, which I eventually figured out was tied to needing MotionBlur ON). I had put iFPSClamp=60 in my Fallout4.ini file as a way to fix this issue, and left it there, because it didn't seem to be harming anything.

Flash forward nearly 100 play hours later, and I was noticing problems, that I thought was a modding issue, but turns out it was just this small line of code, that I put myself, lol. So yeah, thanks a lot! The game still runs at 45 FPS in these areas, but it's better than being permanently stuck in bullet time until I leave these places (which could take 10 minutes at times, due to the slow down).

Good to hear!
Rkillah Tattoo May 8, 2024 @ 8:08pm 
Originally posted by RetroTekGuy:
Yes hi guys all good, Fixed it. It was the iFPSClamp in my ini, Basically its an fps clamp to reduce stuttering but only works when you can hold a steady fps, And since I installed this new modpack my fps was dropping so it was capping the engine speed to that clamp. Removed it and all is well.

In 2024 this help me, just thank you!
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Date Posted: Jul 8, 2017 @ 5:15am
Posts: 13