I have no idea why anybody has issues with slowness on this OS. I don't have a lot of crud on my Mac.
I don't need a little meter in my menu bar telling me when its hot, cold, wet, or dry.
I don't need the color of the Dock to change.
I don't need colored icons in the sidebar.
I don't install any software provided by a peripheral device manufacturer (except the bundled printer drivers).
I don't get my internet from my USB port--that's for keyboards and mice, not ethernet comm.
I don't use a mouse and keyboard that requres a kernel extension to run--yeah, that may be one fabulous keyboard, but if you can't make it work without wedging yourself into the kernel...
I'm not an audio engineer, so I don't have lots of MIDI devices and the software to support them.
I have learned over the years that there is not a single "maintenance" program that should be used--most shouldn't be used ever. Some have some good one-click routines to solve individual problems, but I haven't used one since Leopard.
I'm not a heavy email user. I've got several accounts, but none are life-critical or profession-critical.
I don't need to easily update my "status" as I have no status to update.
While my account is somewhat spartan, my wife has an enormous iPhoto and iMovie Library. We're close to filling a 1TB startup drive, and I've got almost 3TB of movies on externals, and they are backed up on various drives.
I never install anything unless I know how to uninstall it. If it doesn't come with an uninstaller (for those that need an installer) or simple to follow instructions, then I don't install it in the first place. Way back in the early days of both Mac and Windows, software developers felt they needed to provide a unique operating experience for their customers. That wasn't The Macintosh Way. If a piece of software didn't use the built-in UI, I (and apparently many others) didn't buy the software. Why developers feel they need to "roll their own" UI baffles me. I understand there may be some unique piece of software that requires it, but it ought to be rare.
I don't remember if it is on this thread, but I have seen posts where the kernel_task is using upwards of 4GB of memory. That makes no sense for any OS, yet people believe it is normal and blame it solely on Mavericks, like Apple put out an OS that uses twice as much RAM as the recommended minimum.
I realize not everyone cares (or needs to care) about that. However, a computer is not a toaster. You don't just stick in a slice of bread and push down the lever. However, much like a standard toaster, you can't put in a piece of bread with the jelly already larded on. You can't add lox to your bagel until it pops out. If you do that, it won't work very well in the future.
While it may look bad here in the trenches, there really isn't that much going wrong for most people. I'll throw in the slowness thing and we have three major issues affecting a very small subset of the user base. Mavericks is being installed at a faster rate than previously seen. If the problems were soleley due to the OS, there would be a lot more individuals posting here with problems. I am certain the changes to the OS are part of the problem, but it's going to take the third-party developers to address the changes that affected their software. So, waiting for a "patch" from Apple isn't a logical solution to any of these problems. However, it may work out because by the time Apple releases 10.9.1 or .2, the third-party software may also get updated. On the other hand, if your Mac is mission/life-critical, and you don't have the time to tinker, then you should revert back and wait.
The bottom line is we can only offer suggestions on where to look for trouble. Without experiencing it first-hand, we can only guess at what is causing the problem and at what to do to try to alleviate it. A lot of that guessing is enhanced by seeing how things have affected the OS in the past, as reported here, and in our own personal experience. There isn't a "magic" command we can suggest that will repair the problem. However, sometimes, just reinstalling over the current install will fix some things. Even if we isolate a "problem child" and remove it, it may have caused enough damage that a re-install is necessary.
For what it's worth, here is the my output from EtreCheck. I just restarted last night to get iTunes to not forget my iPhone, so there is not much going on memory-wise.
Hardware Information:
Mac mini - model: Macmini6,2
1 2.3 GHz Intel Core i7 CPU: 4 cores
16 GB RAM
Video Information:
Intel HD Graphics 4000 - VRAM: 1024 MB
Startup Items:
MySQLCOM - Path: /Library/StartupItems/MySQLCOM
VirtualBox - Path: /Library/StartupItems/VirtualBox
System Software:
OS X 10.9 (13A603) - Uptime: 0 days 10:15
Disk Information:
APPLE HDD HTS541010A9E662 disk0 : (1 TB)
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) /: 999.35 GB (79.12 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
EFI (disk6s1) <not mounted>: 209.7 MB
Delorean 1 (disk6s2) /Volumes/Delorean 1: 999.86 GB (49.7 GB free)
EFI (disk4s1) <not mounted>: 209.7 MB
Video 2 (disk4s2) /Volumes/Video 2: 2 TB (1.6 TB free)
BarneyGo (disk3s1) /Volumes/BarneyGo: 500.11 GB (293.24 GB free)
FireWire Information:
Apple Computer, Inc. iSight 200mbit - 400mbit max
Seagate Backup+ Desk Mac 800mbit - 800mbit max
disk2s1 (disk2s1) <not mounted>: 209.7 MB
Video Backup (disk2s2) /Volumes/Video Backup: 3 TB (607.65 GB free)
Seagate GoFlex Desk Mac 800mbit - 800mbit max
EFI (disk1s1) <not mounted>: 209.7 MB
Video (disk1s2) /Volumes/Video: 2 TB (13.16 GB free)
PI-367 USB2.0 & 1394 & eSATA combo Drive 800mbit - 800mbit max
EFI (disk5s1) <not mounted>: 209.7 MB
DeLorean (disk5s2) /Volumes/DeLorean: 3 TB (565.68 GB free)
Kernel Extensions:
org.virtualbox.kext.VBoxDrv Version: 4.2.18
org.virtualbox.kext.VBoxUSB Version: 4.2.18
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
[loaded] com.adobe.fpsaud.plist
[loaded] com.barebones.authd.plist
[loaded] com.barebones.textwrangler.plist
[loaded] com.bombich.ccc.plist
[loaded] com.bombich.ccc.scheduledtask.9C5D17DD-1161-46AB-8647-D821BBBC4724.plist
[loaded] com.bombich.ccc.scheduledtask.E5CD5CC7-1DD7-41CC-88FA-B41172639B6F.plist
[loaded] com.microsoft.office.licensing.helper.plist
[loaded] org.macosforge.xquartz.privileged_startx.plist
Launch Agents:
[loaded] org.macosforge.xquartz.startx.plist
User Launch Agents:
[loaded] com.adobe.ARM.202f4087f2bbde52e3ac2df389f53a4f123223c9cc56a8fd83a6f7ae.plist
[loaded] com.bombich.ccc-user-agent.plist
[loaded] com.google.keystone.agent.plist
[loaded] com.valvesoftware.steamclean.plist
[loaded] org.blacktree.quicksilver.plist
[not loaded] org.virtualbox.vboxwebsrv.plist
User Login Items:
Quicksilver
VirtualBox Menulet
Dropbox
MicrosoftKeyboardHelper
MicrosoftMouseHelper
3rd Party Preference Panes:
Flash Player
Flip4Mac WMV
MySQL
Perian
Secrets
Internet Plug-ins:
Default Browser.plugin
Flash Player.plugin
FlashPlayer-10.6.plugin
Flip4Mac WMV Plugin.plugin
GarminGpsControl.plugin
iPhotoPhotocast.plugin
OfficeLiveBrowserPlugin.plugin
QuickTime Plugin.plugin
SharePointBrowserPlugin.plugin
Silverlight.plugin
User Internet Plug-ins:
Bad Fonts:
None
Top Processes by CPU:
3% WindowServer
2% EtreCheck
0% hidd
0% softwareupdated
Top Processes by Memory:
328 MB mds_stores
262 MB Xcode
229 MB iTunes
180 MB Safari
180 MB com.apple.IconServicesAgent
164 MB softwareupdated
147 MB WindowServer
115 MB storeagent
98 MB installd
98 MB Maps