Profile load(...) statements.
Update dummy rendering.
Add build.js optimization pass to fold identifiers of the form |XXX_....|.

This helps a lot in interpreter loops since table switches are not emitted for this case:

var OP_add = 0;
var OP_sub = 1;

switch (op) {
  case OP_add: ... break;
  case OP_sub: ... break;
}

This pass transforms the code above as follows:

var OP_add = 0;
var OP_sub = 1;

switch (op) {
  case 0: ... break;
  case 1: ... break;
}
Added more timing markers.
Preload UTF Strings using the JavaScript parser instead.