1 files changed, 8 insertions, 3 deletions
diff --git a/ice40/arch.cc b/ice40/arch.cc
index 98e6d4c7..9dbc78bb 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -631,9 +631,14 @@ bool Arch::place()
 {
     if (!placer1(getCtx(), Placer1Cfg(getCtx())))
         return false;
-    TimingOptCfg tocfg(getCtx());
-    tocfg.cellTypes.insert(id_ICESTORM_LC);
-    return timing_opt(getCtx(), tocfg);
+    if(bool_or_default(settings, id("opt_timing"), false)) {
+        TimingOptCfg tocfg(getCtx());
+        tocfg.cellTypes.insert(id_ICESTORM_LC);
+        return timing_opt(getCtx(), tocfg);
+    } else {
+        return true;
+    }
+
 }
 
 bool Arch::route() { return router1(getCtx(), Router1Cfg(getCtx())); }