Most smart cards based on the Java Card need an installer for deploying a new applet into its memory after the cards were issued. Installing the applet takes lots of time because of unique components downloading and hardware limitations. An efficient installation for applets in the Java Card platform is investigated. The proposed scheme could improve applet installation time significantly compared to the conventional scheme by fully utilizing available RAM space and could present the best a block size to be transferred between a terminal and JCRE.