perf: throttle malloc_trim + avoid VecDeque clones (squashed)

Squash of 2 yoda commits:
- 77262dd0 perf(malloc): throttle malloc_trim to 1 Hz in hot paths
- 1d98eee6 perf(widget): avoid VecDeque clone in segmented_button/table Model::clear

src/widget/table/model/mod.rs

@@ -98,7 +98,10 @@ where
     /// model.clear();
     /// ```
     pub fn clear(&mut self) {
-        for entity in self.order.clone() {
+        // `remove()` mutates `self.order`, so transfer ownership first:
+        // the inner `self.order.remove(index)` then no-ops because
+        // `position()` can't find the entity in the empty VecDeque.
+        for entity in std::mem::take(&mut self.order) {
             self.remove(entity);
         }
     }