diff --git a/crates/applications/buffer_proto5/src/main.rs b/crates/applications/buffer_proto5/src/main.rs
index 3818116..de75c94 100644
--- a/crates/applications/buffer_proto5/src/main.rs
+++ b/crates/applications/buffer_proto5/src/main.rs
@@ -414,7 +414,6 @@ fn run_sim(id: u32, p: Params, g: Geometries) -> Results {
     let mut driver = Driver::new(SpirvSim::<f32, Mat, WgpuBackend>::new(
         g.dim.to_index(p.geom.feat_size), p.geom.feat_size
     ));
-    driver.set_steps_per_stim(1000);
     if !driver.add_state_file(&*format!("{}/state.bc", prefix), 16000) {
         // mu_r=881.33, starting at H=25 to H=75.
         let ferro_mat = mat::Ferroxcube3R1MH::new();
diff --git a/crates/applications/sr_latch/src/main.rs b/crates/applications/sr_latch/src/main.rs
index 30dce16..e5c47e7 100644
--- a/crates/applications/sr_latch/src/main.rs
+++ b/crates/applications/sr_latch/src/main.rs
@@ -143,8 +143,6 @@ fn main() {
     // render a couple CSV files: one very detailed and the other more sparsely detailed
     driver.add_csv_renderer(&*format!("{}meas.csv", prefix), 200, None);
     driver.add_csv_renderer(&*format!("{}meas-sparse.csv", prefix), 1600, None);
-    // how frequently to re-evaluate the stimulus (Sample & Hold interpolation between evaluations)
-    driver.set_steps_per_stim(1000);
 
     driver.step_until(Seconds(duration));
 }
diff --git a/crates/coremem/src/driver.rs b/crates/coremem/src/driver.rs
index 7b554ff..0453a8d 100644
--- a/crates/coremem/src/driver.rs
+++ b/crates/coremem/src/driver.rs
@@ -6,7 +6,7 @@ use crate::real::Real;
 use crate::render::{self, MultiRenderer, Renderer};
 use crate::sim::AbstractSim;
 use crate::sim::units::{Frame, Time};
-use crate::stim::{self, AbstractStimulus};
+use crate::stim::AbstractStimulus;
 
 use log::{info, trace};
 use serde::{Deserialize, Serialize};
@@ -23,13 +23,16 @@ pub struct Driver<S> {
     render_pool: ThreadPool,
     render_channel: (SyncSender<()>, Receiver<()>),
     measurements: Vec<Arc<dyn AbstractMeasurement<S>>>,
-    stimuli: StimuliAdapter,
+    stimuli: DynStimuli,
     /// simulation end time
     sim_end_time: Option<Frame>,
     diag: SyncDiagnostics,
     last_diag_time: Instant,
 }
 
+/// generic stimuli collection which monomorphizes everything by boxing it.
+pub type DynStimuli = Vec<Box<dyn AbstractStimulus>>;
+
 impl<S: AbstractSim> Driver<S> {
     pub fn new(mut state: S) -> Self {
         let diag = SyncDiagnostics::new();
@@ -45,7 +48,7 @@ impl<S: AbstractSim> Driver<S> {
                 Arc::new(meas::Energy::world()),
                 Arc::new(meas::Power::world()),
             ],
-            stimuli: StimuliAdapter::new(),
+            stimuli: DynStimuli::new(),
             sim_end_time: None,
             diag,
             last_diag_time: Instant::now(),
@@ -59,10 +62,6 @@ impl<S: AbstractSim> Driver<S> {
     pub fn add_measurement<Meas: AbstractMeasurement<S> + 'static>(&mut self, m: Meas) {
         self.measurements.push(Arc::new(m));
     }
-
-    pub fn set_steps_per_stim(&mut self, steps_per_stim: u64) {
-        self.stimuli.frame_interval = steps_per_stim;
-    }
 }
 
 impl<S: AbstractSim> Driver<S> {
@@ -161,11 +160,6 @@ impl<S: AbstractSim + Clone + Default + Send + 'static> Driver<S> {
     fn step_at_most(&mut self, at_most: u32) -> u32 {
         assert!(at_most != 0);
         let start_step = self.state.step_no();
-        if self.stimuli.should_apply(start_step) {
-            self.stimuli.real_time = self.state.time();
-            self.stimuli.time_step = self.state.timestep();
-            trace!("updating stimuli");
-        }
 
         if self.renderer.any_work_for_frame(start_step) {
             self.render();
@@ -253,54 +247,3 @@ impl<S: AbstractSim> Driver<S> {
         });
     }
 }
-
-/// Adapts the stimuli to be applied only every so often, to improve perf
-struct StimuliAdapter {
-    stim: Vec<Box<dyn AbstractStimulus>>,
-    /// How many frames to go between applications of the stimulus.
-    frame_interval: u64,
-    real_time: f32,
-    time_step: f32,
-}
-
-impl AbstractStimulus for StimuliAdapter {
-    fn at(&self, t_sec: f32, pos: Meters) -> stim::Fields {
-        self.stim.at(t_sec, pos)
-        // TODO: remove this stuff  (here only for testing)
-        /*
-        if true {
-            // interpolation unaware (i.e. let the Sim backend do it)
-        } else if false {
-            // delta-fn "interpolation"
-            self.stim.at(t_sec, pos) * (self.frame_interval as f32)
-        } else if false {
-            // step-fn "interpolation"
-            self.stim.at(self.real_time, pos)
-        } else {
-            // linear interpolation
-            let interp_width = self.frame_interval as f32 * self.time_step;
-            let prev = self.stim.at(self.real_time, pos);
-            let next = self.stim.at(self.real_time + interp_width, pos);
-            let interp = (t_sec - self.real_time) / interp_width;
-            prev * (1.0 - interp) + next * interp
-        }
-        */
-    }
-}
-
-impl StimuliAdapter {
-    fn new() -> Self {
-        Self {
-            stim: Default::default(),
-            frame_interval: 1,
-            real_time: 0.0,
-            time_step: 0.0,
-        }
-    }
-    fn should_apply(&self, frame: u64) -> bool {
-        (frame % self.frame_interval == 0) && self.stim.len() != 0
-    }
-    fn push(&mut self, s: Box<dyn AbstractStimulus>) {
-        self.stim.push(s)
-    }
-}