If PJ64 1.6/1.7 lags for you, i recommend to use PJ64 2.0;
Due to high polys custom objects, it might lag with an emu, that
doesn't overclock the N64 as hard as 2.0 does.

visit
http://www.youtube.com/user/KazeBG0
for more hacks.
>moving on to Super Zelda 64