I can't write any longer in Skritter (I'm using mouse). When I try to write, Skritter cannot recognize the strokes most of the time and is also very, very slow. This is regardless, whether I use IE, Firefox or Chrome. I have re-installed the flash player (10.3.181.04),but still the same. At the time, when this problem occurred, I tried another PC in my office and it worked without problems. Seems to be a problem just on my laptop. I also checked display driver, etc. everything OK. I also had again at the same time the problem, that when I click once, Skritter understands a double-click.
I had this problem already in the past, but very rarely. Now it seems to be a permanent problem. Has anybody experienced such a problem before or has a suggestion, what to try out?
Thanks

Can you check your other Firefox add-ons? And I forget if you're using a Wacom, but the Wacom settings if you are. Also, please note your exact Firefox version.

Do you see performance problems on other Flash sites?

I use: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13
The other plug-ins are: Adobe Acrobat, Google Update, iTunes Application Detector, Java Deployment Toolkit and Platform SE 6 U25, Microsoft DRM, Mozilla Default Plug-in, Picasa, Quick Time, Shockwave Flash and Shockwave for Director, Windows Media Player and Presentation Foundation, WPI Application Detector. All are unchanged since quite some while (except might be some updates).
The problem is the same, when I use Chrome or IE. I had used Wacom, but I de-installed it completely some time ago; it was still working normal after the de-installation.
I'm getting 2 or 3 times per day this event (information, not an error or warning):"The browser has forced an election on network \Device\NetBT_Tcpip_{C96C679B-BF35-439A-AB59-203DB0DDB4E8} because a master browser was stopped" and a warning "TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts."
Besides this, I have not encountered any performance problem on other web-pages or the network itself. Nevertheless, I will take my laptop back home today and see, whether the behavior is still the same from another network.
In the device manager, all devices and adapters are shown as normal and no conflicts.
Thanks for looking into this.

@Roland Try googling for the error message “TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts.”
It seems that it is a security feature imposed by MS to prevent the rapid spread of malware. So, may be your computer has been infected if you are not also running any P2P program.

You can also look at CPU usage, both of the Flash plugin (if you're using Chrome, Tools -> Task Manager) and of Windows itself using the Windows task manager. Look to see whether it's Flash or some other process using up all the CPU when this is happening. You can also press Ctrl+Alt+F with Skritter's Flash window focuses to get Skritter's framerate and memory display. Some of these diagnostics might give some more info as to where the slowness is.

Nick, Pts, thanks for your suggestions. Meanwhile, I could fix the problem: it's a hardware problem of my mouse. Once I changed it to another PC, the problem also changed over to this other PC. When I reset the mouse, the problem disappears, but showing up again after a while. So I assume, it's hw related, as the other PC's in my office, which are using the same type of mouse, do not have this problem. It's a Logitech wireless Laser mouse. (In case any other user might have such problem in the future)