Why does a loop over an array of 240+ elements run 10 times slower in Rust?

Hello, colleagues. I'm learning Rust and encountered what seems to me inexplicable behavior. I wrote a simple benchmark: summing array elements in a `for` loop. For arrays up to 239 elements, everything is blazing fast (less than 1 μs). As soon as the size reaches 240, the execution time jumps sharply to 10–15 μs. Further size increases give a smooth increase in time, but this first 10x jump puzzled me. Here's the code I'm testing: ```rust use std::time::Instant; fn sum_array(arr: &[i32]) -> i32 { let mut sum = 0; for &x in arr { sum += x; } sum } fn main() { let size = 240; let arr: Vec = (0..size).collect(); let start = Instant::now(); let _ = sum_array(&arr); println!("{:?}", start.elapsed()); } ``` I