my windows 8 suddenly is running very slow, long time to load program

Yes. My laptop was getting slow after 3 months of use even though it is Core i7 processor.. BUT I found a very good blog post here. After I did this, my laptop became lot faster !!!!!!!

Try this link here: 

https://www.pntbrother.com/windows-8-7-optimization-make-windows-8-7-faster/

I was considering to upgrade my ram but I don't need now. 

Thank you.

Okay. So we are in the matrix. And you are probably out. 

Consider this: The clamour of the dissatisfied 'many' would only jeopardize the status quo's status quo, inviting questions and protests. Big players in tech are without doubt complicit & complacent, but keeping things running satisfiably smooth is in their best interests. Messing up isn't as much an indicator of their diabolique, as their ineptitiude; not that they are mutually exclusive. 

Quoting:

Your 'prescription' is only as accessible to the 'many' as the "replies, resolutions & discussions" in any of these 'official' fora, if not less. Expecting "suckers" to "smarten up" epitomizes your belief that your abilities are a product of your 'singular' efforts and your self-enlightened choices in the backdrop of an egalitarian idiocracy. Egalitarian, because, apparently, situated contexts and organic propensities that define individual variation count for nothing, and you just willfully emerged from a flat seabed. 

Getting back to Windows 8, if you have singularly birthed an OS, free from all your identified trappings, try making it accessible to a 12 year old, a 22 year old..., an 82 year old. Consider variations in gender, culture, language, cognitive orientations, if you can. Then observe them, ask them, improve your designs. If your purpose is for the the 'many' to evolve technologically (and not just consume) then let your systems and applications be built on that principle. Help them embrace a bit of meta-cognition.

If you would rather point laugh poke, then let us be, and let us struggle to fake repair a frivolous rupture in a mythical matrix whose subliminal conditioning relegates us to the ignominy of fuel pods.

Bottomline: My Windows 8 has been dead slow since Sep 2013. I have now 'woken up' and seek a real remedy, a real remedy.

*Not near-automated responses from Microsofties whose replies sound like a broken Windows 8 defending itself in a court of law, by jangling keys to my face. 

*Not pseudo-geeks telling me that the Wachowski brothers are waiting to cast me in their next and will give me a utopic Apple product for each Windows-running product I break.

Windows has ALWAYS been known for spying on you and reporting your activity to remote servers.  Windows XP was more a culprit than 2000/NT.  Windows Vista was worse and was loaded with related bugs to boot.  Windows 7 they made the spyware far worse, embedding it in the Power Management service so the OS (including sound for some reason) would not operate if it were disabled.  Then Windows 8 came out and became less transparent, and even more of lame dog that spies on you and reports home.  Compare these specs for recent version of Windows:

If you have half a brain you will notice a very obvious trent of using more and more and more of the hardware for very basic, simple operation of the OS.  The requirements listed above do not tell the whole story.  Early versions of Windows ran decently enough with the listed requirements.  However, these days the minimum specs means, "this will run on your computer THE FIRST TIME", but as soon as you start installing updates your whole computer is ****.  If you don't install them Microsoft works to find a way to force you to do so.  Why do they do this?  It is a well-known factual fact that Microsoft (along with many other companies) partners with the NSA to spy on you.  Research "prism", an NSA program, if you do not understand this

Now look at these vast specs that are required for current versions of Windows.  Has computer functionality really grown that much in all this time?  It seems like MS has taken advantage of the increased hardware to disguise the fact that the largest modern functions of their OS are tools for spying on you.  Nobody can tell anymore because the OS is so bloated you could never sort out what was what, and new versions of Windows are released so fast that you could never hope to get one OS figured out before the next comes.  All of Microsoft's OS functionality is hidden and inaccessible to the user under any circumstances, except those that Microsoft decided to allow through high-level interfaces.

Ever since before Windows 7 I have spent a good amount of my time online researching this known problem or that.  I always wind up on this website and see all these poor stupid users (get this) "asking questions of Microsoft" as to why their OS won't work.  Now why in the hell do you think that MS would be interested in helping you undo all the spyware they have  been enthusiastically embedding in their OS for so long?  Every time I hear the same issues asked, revolving around the parts of the OS that ALWAYS have trouble with this Windows version or that, MS always replies with a seriously long list of things to try to get it working.  Now, I don't know who these representatives are, so I can't say whether they actually know they are lying to you.  But make no mistake, the "official" solution to your problem is to give you the runaround.  There is no solution here for known issues regarding DcomLaunch, the Power, and Plug and Play services in Windows 7.  I'm not a Windows 8 user, but this issue that many seem to have, which MS cannot give a solution for, are VERY OBVIOUSLY the same kinds of issues.  If MS had wanted to fix these known issues that everyone is having, they could have done so before releasing the OS, when the problems were undoubtedly discovered in testing, but they did not.  On the contrary, it is more likely they gave you a clean OS and later developed spyware to push out via updates.

Do not make the mistake of thinking you will get a real answer in these forums.  Maybe answers related to "OS functionality", but you will never get a real bugfix for any major issue here.  Don't even waste your time.

Just to drive the point home here, consider that Lightweight Linux variants can run in 50mb of space/50mb memory, and that there are full-featured GUI environments that use under 100mb of RAM.  The best of these use almost no CPU or memory, and are unlikely to ever start using resources out of control.  Even if they do, you can just disable anything that is causing the problem.

Now companies with the same "motivations" as MS are releasing things like Ubuntu, Linux Mint, and stuff like that.  BEWARE.  These are simply Linux versions containing spyware like MS, that are designed to trap all the poor unfortunate suckers who thought they were doing themselves a favor by migrating from Windows.  Get yourself a lightweight Linux distro, follow a guide (or guides) to get it up and running the way you want it, and then enjoy your awesome computer forever.

I also have this problem. My PC has been fine for years. Then the GWX spam for windows 10 began. I'm assuming that Microsoft is intentionally making Windows 8.1 performance slow so as to push customers to buy Windows 10 which has a lot of invasive features.

I've optimised my PC more than ever and yet the nearer we get to the Windows 10 release date, the slower the performance gets. Programs often become unresponsive and there are freezes for NO REASON. If something is using the computers power, it should show up in a performance monitor however it does not, other than to say software randomly goes unresponsive.

My computer is excellent. I even have 32gb of ram because it's a work PC for doing state of the art visuals and animation. I never had these issues before, they all  began about 1 week - 2 weeks after the GWX spam began.

Pathetic.