browse-url-netscape-program is a variable defined in `browse-url.el'.
Its value is

  • This variable may be risky if used as a file-local variable.

The name by which to invoke Netscape.

The free program `netscape-remote' from
is said to start
up very much quicker than `netscape'. Reported to compile on a GNU
system, given vroot.h from the same directory, with cc flags
-DSTANDALONE -L/usr/X11R6/lib -lXmu -lX11.

You can customize this variable.