diff --git a/Project.toml b/Project.toml
index 9b028987..0de0a0d0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "ClimaTimeSteppers"
 uuid = "595c0a79-7f3d-439a-bc5a-b232dc3bde79"
 authors = ["Climate Modeling Alliance"]
-version = "0.7.37"
+version = "0.7.38"
 
 [deps]
 ClimaComms = "3a4d1b5c-c61d-41fd-a00a-5873ba7a1b0d"
diff --git a/perf/jet.jl b/perf/jet.jl
index ad230cb4..9a78c1c5 100644
--- a/perf/jet.jl
+++ b/perf/jet.jl
@@ -60,5 +60,5 @@ end
     JET.@test_opt CTS.step_u!(integrator, integrator.cache)
 
     CTS.__step!(integrator) # compile first, and make sure it runs
-    JET.@test_opt broken = true CTS.__step!(integrator)
+    JET.@test_opt CTS.__step!(integrator)
 end
diff --git a/src/integrators.jl b/src/integrators.jl
index 66bd8441..09345304 100644
--- a/src/integrators.jl
+++ b/src/integrators.jl
@@ -225,6 +225,17 @@ is_past_t(integrator, t) = tdir(integrator) * (t - integrator.t) < zero(integrat
 reached_tstop(integrator, tstop, stop_at_tstop = integrator.dtchangeable) =
     integrator.t == tstop || (!stop_at_tstop && is_past_t(integrator, tstop))
 
+
+@inline unrolled_foreach(::Tuple{}, integrator) = nothing
+@inline unrolled_foreach(callback, integrator) =
+    callback.condition(integrator.u, integrator.t, integrator) ? callback.affect!(integrator) : nothing
+@inline unrolled_foreach(discrete_callbacks::Tuple{Any}, integrator) =
+    unrolled_foreach(first(discrete_callbacks), integrator)
+@inline function unrolled_foreach(discrete_callbacks::Tuple, integrator)
+    unrolled_foreach(first(discrete_callbacks), integrator)
+    unrolled_foreach(Base.tail(discrete_callbacks), integrator)
+end
+
 function __step!(integrator)
     (; _dt, dtchangeable, tstops) = integrator
 
@@ -246,13 +257,7 @@ function __step!(integrator)
 
     # apply callbacks
     discrete_callbacks = integrator.callback.discrete_callbacks
-    for (ncb, callback) in enumerate(discrete_callbacks)
-        if callback.condition(integrator.u, integrator.t, integrator)::Bool
-            NVTX.@range "Callback $ncb of $(length(discrete_callbacks))" color = colorant"yellow" begin
-                callback.affect!(integrator)
-            end
-        end
-    end
+    unrolled_foreach(discrete_callbacks, integrator)
 
     # remove tstops that were just reached
     while !isempty(tstops) && reached_tstop(integrator, first(tstops))