Make icons appear quicker than before

You need to alter the maximum size of Windows Icon Cache for this purpose...
Open Start menu -> Run -> regedit and Navigate to the following registry location...

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
  

and create / modify the REG_SZ(String) value named Max Cached Icons and set its value between 100-4096 ... the default value is 500 (i.e., 500 KB). Maximum is 4096.