Open the file D:\fmw1115\Middleware\jdeveloper\ide\bin\ide.conf
and change the lines
AddVMOption -Xmx1024M
AddVMOption -Xms128M
Also open the file D:\fmw1115\Middleware\jdeveloper\jdev\bin\jdev.conf
and change the line
AddVMOption -XX:MaxPermSize=256M