diff --git a/main/minivm.c b/main/minivm.c
index 193506d0..1852d1ec 100644
--- a/main/minivm.c
+++ b/main/minivm.c
@@ -17,7 +17,8 @@ void vm_lang_lua_repl(vm_config_t *config, vm_table_t *std, vm_blocks_t *blocks)
 int main(int argc, char **argv) {
     vm_config_t val_config = (vm_config_t) {
         .use_num = VM_USE_NUM_I32,
-        .tb_lbbv = false,
+        .tb_lbbv = true,
+        .tb_regs_cast = true,
         .tb_recompile = true,
 #if defined(EMSCRIPTEN)
         .target = VM_TARGET_TB_EMCC,
diff --git a/vm/backend/exec.c b/vm/backend/exec.c
index 5dc4d9b6..ca18fcc4 100644
--- a/vm/backend/exec.c
+++ b/vm/backend/exec.c
@@ -28,7 +28,8 @@ void *vm_cache_comp(const char *comp, const char *flags, const char *src, const
         fwrite(src, len, 1, out);
         fclose(out);
         vm_io_buffer_t *cmd_buf = vm_io_buffer_new();
-        vm_io_buffer_format(cmd_buf, "%s -shared -O2 -foptimize-sibling-calls -fPIC %s %s -o %s -w -pipe", comp, flags, c_file, so_file);
+        // vm_io_buffer_format(cmd_buf, "%s -shared -g3 -foptimize-sibling-calls -fPIC %s %s -o %s -w -pipe", comp, flags, c_file, so_file);
+        vm_io_buffer_format(cmd_buf, "%s -shared -O3 -foptimize-sibling-calls -fPIC %s %s -o %s -w -pipe", comp, flags, c_file, so_file);
         int res = system(cmd_buf->buf);
         if (res) {
             return NULL;
@@ -97,15 +98,16 @@ void *vm_cache_comp(const char *comp, const char *flags, const char *src, const
         fclose(out);
         vm_io_buffer_t *cmd_buf = vm_io_buffer_new();
         vm_io_buffer_format(cmd_buf, "%s -shared -O3 -foptimize-sibling-calls -fPIC %s %s -o %s -w -pipe", comp, flags, c_file, so_file);
+        // vm_io_buffer_format(cmd_buf, "%s -shared -g3 -fsanitize=memory -foptimize-sibling-calls -fPIC %s %s -o %s -w -pipe", comp, flags, c_file, so_file);
         int res = system(cmd_buf->buf);
         if (res) {
             return NULL;
         }
-        remove(c_file);
+        // remove(c_file);
     }
     void *handle = dlopen(so_file, RTLD_LAZY);
     void *sym = dlsym(handle, entry);
-    remove(so_file);
+    // remove(so_file);
     return sym;
 }
 #endif