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My Galaxy S7 had terrible battery life since Oreo update,
I had like 3-5% battery usage per hour with screen OFF and phone idle
 
I found a fix I read somewhere that I should try to turn off LTE ( switch to "auto 2G/3G" in settings, even though I was on WiFi and mobile data weren't in use) 
so I tried and.. v'oila I have exceptionally good battery life now  around 1% (max. 2%) of battery drain per hour, now my phone can last whole day easy ^^
and reception of the signal is better (I have all 4 lines of signal - when LTE was ON it was max 3 around my living area)
 
So it seems like when phone really tries to get this good LTE signal it drains battery very fast, but when it doesn't have to - then everything is OK
Maybe this will also help one of you  maybe @LinusTech could also use this fix to.. fix his S9 battery life

My Galaxy S7 had terrible battery life since Oreo update,
I had like 3-5% battery usage per hour with screen OFF and phone idle
 
I found a fix I read somewhere that I should try to turn off LTE ( switch to "auto 2G/3G" in settings, even though I was on WiFi and mobile data weren't in use) 
so I tried and.. v'oila I have exceptionally good battery life now  around 1% (max. 2%) of battery drain per hour, now my phone can last whole day easy ^^
and reception of the signal is better (I have all 4 lines of signal - when LTE was ON it was max 3 around my living area)
 
So it seems like when phone really tries to get this good LTE signal it drains battery very fast, but when it doesn't have to - then everything is OK
Maybe this will also help one of you  maybe @LinusTech could also use this fix to.. fix his S9 battery life

00:00 (Midnight) is 12:00AM
12:00 (Midday) is 12:00PM

Benchmarks comparing performance with the patch/without the patch:
TL;DW:
NVMe SSD read/write performance is affected (up to 20% in some cases) CPU performance in everyday tasks is not affected Gaming performance is not affected So most users aren't going to be affected by this patch. Thank goodness!

start -> cog icon -> updates and security -> restore (or something like that, I have Polish language)

I had similar issue, I bought SSD, moved windows to SDD from HDD and noticed that Windows load slowly
 
What helped - belive it or not - were 2 things:
 
1. connect HDD sata cable to SATA port number 3 on my MOBO (firsly it was SSD - sata 1, HDD - sata 2 - and it was weirdly slow)
2. Changed IDE mode to AHCI under SATA mode in BIOS 
 
System now loads like it should

There are plenty of possible reasons, start with looking at Task Manager, like @knightslugger suggested

probrably coil whine, it can sound like buzzing, or in my expirience even like ticking
This was my case:
https://www.youtube.com/watch?v=GyP-4Fq4NKA
 
Only solution - warranty repair

Maybe your PSU is giving them too much power causing the power delivery the cards (capacitors, resistors, chokes & MOSFET's) to blow.  

Check selective usb turn off in power options (sorry, non native English speaker here)

As I said on the vid, Linus has 3 small children, they have no known snooze (or volume) button

You wrote it perfect!. If my local international market has Zywiec in stock, I'll pick up some tomorrow after work and I'll drink one for you!. 
 
Egg-Roll, thanks for that information. I'm thinking my issues might be Bios related as I didn't change any of the setting's after installing the hard drive. 

yeah Żywiec, I like it too, it's well known brand here, tomorrow I will drink a cold one to your health (I hope i wrote it right in English)
 
Also I hope my solution will work for You too 

are you for real? windows+r write control panel and press enter.
 
It really isn't rocket science.

I had similar issue, I bought SSD, moved windows to SDD from HDD and noticed that Windows load slowly
 
What helped - belive it or not - were 2 things:
 
1. connect HDD sata cable to SATA port number 3 on my MOBO (firsly it was SSD - sata 1, HDD - sata 2 - and it was weirdly slow)
2. Changed IDE mode to AHCI under SATA mode in BIOS 
 
System now loads like it should

start -> cog icon -> updates and security -> restore (or something like that, I have Polish language)

Only CPU load high and GPU load dropping ? or both very high and at least GPU not dropped ? Because if your CPU is busy doing other things its normal that GPU load goes down and as a result FPS also. 

You set fan curves to react set temps. 3pin fans have starting speed of 30-40%. Set that at temp point where you want to power up. You can test what is your fans starting point with main screens dials.
 
Check some guides on how to setup SpeedFan.

well its clearly a result of this theme pack. Even if it is turned off something is clearly broken. 

a second hand gtx 750

You can find a 750Ti for around £50 if you look hard enough on eBay, and sites alike.

There are a ton of cheap 750ti's out there. Good stuff.

I agree with @Achi a second hand 750ti would be good for your system

750 Ti Definitely 

A bent circuit board holding the sockets inside the PSU. I'd sent it back because it's possible, but it shouldnt affect performance.