Index: ceval.c
===================================================================
--- ceval.c	(revision 42964)
+++ ceval.c	(working copy)
@@ -481,8 +481,8 @@
 
 /* for manipulating the thread switch and periodic "stuff" - used to be
    per thread, now just a pair o' globals */
-int _Py_CheckInterval = 100;
-volatile int _Py_Ticker = 100;
+int _Py_CheckInterval = 1000;
+volatile int _Py_Ticker = 1000;
 
 PyObject *
 PyEval_EvalCode(PyCodeObject *co, PyObject *globals, PyObject *locals)
@@ -846,7 +846,7 @@
 
 		/* line-by-line tracing support */
 
-		if (tstate->c_tracefunc != NULL && !tstate->tracing) {
+		if (0 && tstate->c_tracefunc != NULL && !tstate->tracing) {
 			/* see maybe_call_line_trace
 			   for expository comments */
 			f->f_stacktop = stack_pointer;
@@ -910,8 +910,10 @@
 
 		/* case STOP_CODE: this is an error! */
 
+		/*
 		case NOP:
 			goto fast_next_opcode;
+		*/
 
 		case LOAD_FAST:
 			x = GETLOCAL(oparg);
@@ -2130,7 +2132,7 @@
 		PREDICTED_WITH_ARG(JUMP_ABSOLUTE);
 		case JUMP_ABSOLUTE:
 			JUMPTO(oparg);
-			continue;
+			goto fast_next_opcode;
 
 		case GET_ITER:
 			/* before: [obj]; after [getiter(obj)] */