about Total Memory bits.................

hi all..........

i had one doubt.............

i use an EP3C120F780 FPGA and it has 3,981,312 memory bits....however i cant use more than 73% of this........... (not compile project with more than 3,000,000 memory bits....)

why this occurs? .... can i improve this performance???? how can i reduce these bits......

i need port my projecto to EP4C75 and this had only 2,810,880 memory bits and i need improve this......

thank you for replys

Franz Wagner