The best free PC optimization software 2017

Is your Windows PC running a little slowly? It's not your imagination: over time hard drives accumulate all kinds of things that slow things down. PC optimization software can't solve obsolescence – if your computer is struggling to meet the system requirements for your OS or apps that's a job for more RAM or the addition of an SSD – but if the slowdown is software-related, it can really help.

It's worth noting that you can do much of what these PC optimization apps do yourself using Windows' built-in system maintenance tools, but that's time consuming; what's really being sold here is convenience.

1. Iolo System Mechanic

Enjoy a cleaner, faster PC with the best free PC optimization tool around

Iolo System Mechanic removes junk files and unwanted apps, blocks bloatware and unwanted auto-run settings, clears out RAM and wipes various logs, browser histories and caches. Not only does this free up key system resources, it also eliminates traces of your browsing activity to protect your privacy.

It's PC optimization toolkit really does make a difference; whenever we've tested System Mechanic we've found a significant speed improvement, especially at startup. The free edition is excellent, but the premium version is well worth considering if you find yourself using it regularly: it also includes a file recovery tool, and for US$40 (about £30, AU$50) you're entitled to use it on as many home PCs as you like.

The genuine performance boost we saw after running System Mechanic made it our favorite system optimization tool. Read on for four more of the best apps around for speeding up your Windows PC.

Download here: Iolo System Mechanic

2. IObit Advanced SystemCare

A hands-off approach to optimization that's ideal for novice users

IObit Advanced SystemCare comes in two forms: a free version that covers basic house cleaning, and a Pro version that adds internet speed-boosting, real-time optimization, privacy protection, deep registry cleaning and 24/7 technical support. That's currently US$20 (about £15, AU$25) for a year, and the license covers three PCs.

Whichever edition you choose, IObit Advanced SystemCare's interface is well designed, easy to use and unlikely to frighten even the newest PC user. We'd deduct points for an installer that wants to add additional programs - that's hardly in keeping with the philosophy of keeping unwanted stuff off your computer - but they're easy to avoid if you choose a custom installation.

Like most of the free PC optimization software here, it cleans up files and folders you don't need, neatens up the Windows registry and corrects errors on your hard drive – all via a simple, slick dashboard.

Download here: IObit Advanced Systemcare

3. Piriform CCleaner

Eliminate unnecessary files, clean the registry and manage programs

Piriform CCleaner has been around for a long time, and part of the reason for its ongoing popularity is that it cleans the parts of your PC that many other free system optimization tools don't.

There's a paid-for version of the optimization toolkit that adds real time protection and cleanup scheduling, but the free edition of CCleaner covers the important stuff such as removing temporary files, getting rid of browser caches, removing unwanted cookies while keeping the useful ones and so on.

If your PC just feels sluggish then this is the app to try first. It doesn't have all the advanced features of apps like System Mechanic, but the stuff it does clear is famous for slowing down PCs.

Review and where to download: Piriform CCleaner

4. PC Decrapifier

Just bought a new PC? Clear out the bloatware to improve its performance

PC Decrapifier is a PC optimization tool that's particularly useful on brand new PCs, which are often either full of exciting opportunities to discover new apps or stuffed to the gills with a load of useless junk, depending on your point of view.

If you tend to the latter then then this free app is well worth a look. It analyses your system, shows you the apps it thinks you should get rid of - based not just on its developers' opinions but on other users' feedback - and then removes the ones you choose. It's so focused on cleaning PCs, it doesn't even install itself.

Download here: PC Decrapifier

5. Razer Cortex: Game Booster

Specifically designed to help gamers wring extra performance from their PCs

If your system struggles when you're trying to get your game on, Razer Cortex: Game Booster could well be the answer. This free PC optimization software suspends unnecessary system processes, clears out memory and defrags your system to get the very best game performance possible.

Razer Cortex: Game Booster is available for Windows 7, 8 and 10, and while the differences won't make you jump up and down in astonishment - for most people the results will mean slightly smoother visuals rather than astonishing performance improvements - it does automate the fiddly process of turning off unnecessary software and services when it's time to play.

Download here: Razer Cortex: Game Booster

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