Why does nemo eats up so much CPU (whole core on IDLE)

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As you can see on the screen-dump I' using cinnamon and nemo to replace the nearly unusable (new) gnome 3 environment on FEDORA20

[juergen@nadhhlt yaze-ag-2.30.3]$ uname -a
Linux nadhhlt 3.14.9-200.fc20.x86_64+debug #1 SMP Thu Jun 26 21:23:03 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

top - 15:35:59 up 20:05,  5 users,  load average: 0,44, 0,32, 0,26
Tasks: 251 total,   1 running, 250 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1,7 us,  1,0 sy,  0,0 ni, 96,3 id,  0,3 wa,  0,2 hi,  0,5 si,  0,0 st
KiB Mem:  16325692 total,  8225136 used,  8100556 free,   888440 buffers
KiB Swap: 18440188 total,        0 used, 18440188 free,  2304068 cached
PID to signal/kill [default pid = 7031] 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
 7031 juergen   20   0 1866300 268644  27608 S  14,2  1,6   5:21.14 nemo        
 ###########################################################
 1249 root      20   0  277828  41716  25388 S   3,6  0,3  50:19.82 Xorg        
 2619 juergen   20   0 2152824 398172  47660 S   1,3  2,4  18:22.16 cinnamon    
 9583 juergen   20   0  814228  23500  14316 S   1,0  0,1   0:48.54 gnome-term+ 
 1145 root      20   0    4292    596    504 S   0,3  0,0   0:09.58 rngd        
 1836 mysql     20   0  849568  84788   7840 S   0,3  0,5   1:18.99 mysqld      
 6142 juergen   20   0  123664   1708   1144 R   0,3  0,0   0:17.26 top         
    1 root      20   0   51068   7032   3856 S   0,0  0,0   0:06.34 systemd

But nemo takes a whole core and eats up a lot of system-resources in IDLE mode (only the desktop items will be handled, no file browser or other things are open) If nemo is running on the background, the core temperature comes um near 100°C in few minutes. After I killed nemo (desktop-buttons disappearing) the temperature degrees to 50-60°C and the system turns back to normal IDLE CPU load immediately. Any Idea or Hint?

Sincere Juergen