diff --git a/vyper/venom/__init__.py b/vyper/venom/__init__.py
index 0b13d8a4ec..87cfb0ea2c 100644
--- a/vyper/venom/__init__.py
+++ b/vyper/venom/__init__.py
@@ -53,6 +53,60 @@ def generate_assembly_experimental(
     compiler = VenomCompiler(functions)
     return compiler.generate_evm(optimize == OptimizationLevel.NONE)
 
+# base passes that are run at -Onone. basically just well-formedness passes.
+def _run_base_passes(fn: IRFunction, ac: IRAnalysesCache):
+    FloatAllocas(ac, fn).run_pass()
+
+    # required to fix dom tree
+    SimplifyCFGPass(ac, fn).run_pass()
+
+    MakeSSA(ac, fn).run_pass()
+    #AssignElimination(ac, fn).run_pass()
+    # mem2var makes a huge improvement, but it's not a "base" pass
+    #Mem2Var(ac, fn).run_pass()
+    #MakeSSA(ac, fn).run_pass()
+    SCCP(ac, fn).run_pass()  # required otherwise we run out of stack
+    SimplifyCFGPass(ac, fn).run_pass()
+
+    #AssignElimination(ac, fn).run_pass()
+    LowerDloadPass(ac, fn).run_pass()
+    RemoveUnusedVariablesPass(ac, fn).run_pass()  # required otherwise we run out of stack
+    # well formedness
+    SingleUseExpansion(ac, fn).run_pass()
+
+def _run_stable_passes(fn: IRFunction, ac: IRAnalysesCache) -> None:
+    # Run passes on Venom IR
+
+    FloatAllocas(ac, fn).run_pass()
+
+    # required to fix dom tree
+    SimplifyCFGPass(ac, fn).run_pass()
+
+    MakeSSA(ac, fn).run_pass()
+    PhiEliminationPass(ac, fn).run_pass()
+
+    # run algebraic opts before mem2var to reduce some pointer arithmetic
+    AlgebraicOptimizationPass(ac, fn).run_pass()
+    AssignElimination(ac, fn).run_pass()
+    Mem2Var(ac, fn).run_pass()
+    MakeSSA(ac, fn).run_pass()
+    PhiEliminationPass(ac, fn).run_pass()
+
+    SCCP(ac, fn).run_pass()
+    SimplifyCFGPass(ac, fn).run_pass()
+
+    AssignElimination(ac, fn).run_pass()
+    MemMergePass(ac, fn).run_pass()
+    RevertToAssert(ac, fn).run_pass()
+    SimplifyCFGPass(ac, fn).run_pass()
+
+    LowerDloadPass(ac, fn).run_pass()
+    AssignElimination(ac, fn).run_pass()
+    RemoveUnusedVariablesPass(ac, fn).run_pass()
+    BranchOptimizationPass(ac, fn).run_pass()
+
+    SingleUseExpansion(ac, fn).run_pass()
+
 
 def _run_passes(fn: IRFunction, optimize: OptimizationLevel, ac: IRAnalysesCache) -> None:
     # Run passes on Venom IR
@@ -130,7 +184,11 @@ def run_passes_on(ctx: IRContext, optimize: OptimizationLevel) -> None:
         ir_analyses[fn] = IRAnalysesCache(fn)
 
     for fn in ctx.functions.values():
-        _run_passes(fn, optimize, ir_analyses[fn])
+        #_run_passes(fn, optimize, ir_analyses[fn])
+        if optimize == OptimizationLevel.NONE:
+            _run_base_passes(fn, ir_analyses[fn])
+        else:
+            _run_stable_passes(fn, ir_analyses[fn])
 
 
 def generate_ir(ir: IRnode, settings: Settings) -> IRContext: