Hi Jeremy, I did disable all pasteboard options, killed klipper, no proxy in .xinitrc - but still the same pattern, here are the actual sampling process: :-( Mery Christmas :-) christof Sampling process 1748 for 3 seconds with 1 millisecond of run time between samples Sampling completed, processing symbols... Analysis of sampling X11.bin (pid 1748) every 1 millisecond Call graph: 1910 Thread_2503 1910 start 1910 main 1910 mach_msg_server 1910 mach_startup_server 1910 _Xstart_x11_server 1910 do_start_x11_server 1910 server_main 1910 X11ApplicationMain 1910 -[NSApplication run] 1910 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] 1910 _DPSNextEvent 1910 BlockUntilNextEventMatchingListInMode 1910 ReceiveNextEventCommon 1910 RunCurrentEventLoopInMode 1910 CFRunLoopRunInMode 1910 CFRunLoopRunSpecific 1861 mach_msg 1861 mach_msg_trap 1861 mach_msg_trap 49 0xffffffff 49 _sigtramp 49 _sigtramp 1910 Thread_2603 1910 thread_start 1910 _pthread_start 1910 CAPThread::Entry(CAPThread*) 1910 HALRunLoop::OwnThread(void*) 1910 CFRunLoopRunInMode 1910 CFRunLoopRunSpecific 1910 mach_msg 1910 mach_msg_trap 1910 mach_msg_trap 1910 Thread_2703 1910 thread_start 1910 _pthread_start 1910 server_thread 1910 dix_main 1910 Dispatch 1763 select$DARWIN_EXTSN 1763 select$DARWIN_EXTSN 143 WaitForSomething 83 BlockHandler 59 QuartzBlockHandler 32 NSPopAutoreleasePool 18 NSPopAutoreleasePool 4 objc_assign_strongCast 4 objc_assign_strongCast 3 NSClassFromObject 2 -[NSObject class] 2 -[NSObject class] 1 object_getClass 1 object_getClass 3 objc_msgSend 3 objc_msgSend 2 objc_collecting_enabled 2 objc_collecting_enabled 1 _CFExecutableLinkedOnOrAfter 1 _CFExecutableLinkedOnOrAfter 1 object_getClass 1 object_getClass 9 objc_msgSend 9 objc_msgSend 6 -[NSAutoreleasePool init] 5 -[NSAutoreleasePool initWithCapacity:] 3 NSPushAutoreleasePool 3 NSPushAutoreleasePool 1 -[NSAutoreleasePool initWithCapacity:] 1 -[NSObject class] 1 -[NSObject class] 1 -[NSAutoreleasePool init] 4 objc_collecting_enabled 4 objc_collecting_enabled 3 QuartzBlockHandler 2 +[NSObject alloc] 2 +[NSObject alloc] 2 -[NSAutoreleasePool release] 2 -[NSAutoreleasePool release] 1 dyld_stub_objc_collecting_enabled 1 dyld_stub_objc_collecting_enabled 12 AnimCurScreenBlockHandler 10 AnimCurScreenBlockHandler 2 miSpriteBlockHandler 2 miSpriteBlockHandler 7 objc_msgSend 7 objc_msgSend 3 BlockHandler 1 RootlessBlockHandler 1 RootlessBlockHandler 1 dyld_stub_objc_msgSend 1 dyld_stub_objc_msgSend 19 WaitForSomething 18 GetTimeInMillis 17 gettimeofday 14 __gettimeofday 8 __nanotime 8 __nanotime 6 __gettimeofday 3 gettimeofday 1 GetTimeInMillis 11 WakeupHandler 8 WakeupHandler 2 QuartzWakeupHandler 2 QuartzWakeupHandler 1 NoopDDA 1 NoopDDA 6 select$UNIX2003 6 select$UNIX2003 5 __bzero 5 __bzero 1 select$DARWIN_EXTSN 1 select$DARWIN_EXTSN 2 Dispatch 1 __error 1 __error 1 memset 1 memset 1910 Thread_2803 1910 thread_start 1910 _pthread_start 1910 glvmDoWork 1910 pthread_cond_wait$UNIX2003 1910 __semwait_signal 1910 __semwait_signal 1910 Thread_2903 1910 thread_start 1910 _pthread_start 1910 DarwinProcessFDAdditionQueue_thread 1910 pthread_cond_wait$UNIX2003 1910 __semwait_signal 1910 __semwait_signal 1910 Thread_2a03 1910 thread_start 1910 _pthread_start 1910 xpbproxy_input_thread 1910 pthread_cond_wait$UNIX2003 1910 __semwait_signal 1910 __semwait_signal 1910 Thread_2b03 1910 thread_start 1910 _pthread_start 1910 select$DARWIN_EXTSN 1910 select$DARWIN_EXTSN 1910 Thread_2c03 1910 thread_start 1910 _pthread_start 1910 _xp_async_thread 1910 _xp_async_dequeue 1910 pthread_cond_wait$UNIX2003 1910 __semwait_signal 1910 __semwait_signal Total number in stack (recursive counted multiple, when >=5): 7 _pthread_start 7 thread_start Sort by top of stack, same collapsed (when >= 5): __semwait_signal 7640 mach_msg_trap 3771 select$DARWIN_EXTSN 3674 _sigtramp 49 WaitForSomething 19 objc_msgSend 19 NSPopAutoreleasePool 18 AnimCurScreenBlockHandler 10 WakeupHandler 8 __nanotime 8 __gettimeofday 6 objc_collecting_enabled 6 select$UNIX2003 6 __bzero 5 Sample analysis of process 1748 written to file /dev/stdout -- public key www.hfph.mwn.de/~chwolf/chwolf.asc Please respect my privacy and do not make my contact information available to third parties.