Performance issue - in 4.7 ( previously worked in ECC 6 only)

Hi experts,

I have worked on ECC 6.0 and now i have got a new job and now working in 4.7 for support project. I feel it is very difficult after working in 6.0.

I have not used occurs 0, like etc.. statements in 6.0.

In 4.7 what are the things that i should consider to avoid performance issues.

plz guide me.

thanks in advance.