Driver: update TODOs

crates/coremem/src/driver.rs

@@ -32,7 +32,6 @@ use std::time::Instant;
 pub struct Driver<R, S, Stim=DriverStimulusDynVec<R>> {
     state: S,
     renderer: Arc<MultiRenderer<S>>,
-    // TODO: use Rayon's thread pool?
     render_pool: JobPool<S, ()>,
     measurements: Vec<Arc<dyn AbstractMeasurement<S>>>,
     stimuli: StimAccess<R, Stim>,
@@ -530,6 +529,7 @@ impl<R: Real, T: DriverStimulus<R> + Send + 'static> StimAccess<R, T> {
             let stim = diag.instrument_stimuli(|| {
                 let stim = stim.lock().unwrap();
                 let opt = stim.optimized_for(meta, step);
+                // TODO: remove this box. RenderedStimulus is already heap allocated, so no perf diff?
                 Box::new(opt.as_ref().rendered(
                     meta.time_step().cast(),
                     // TODO: convert this to an integer