Everyone here saying paging is uncommon on modern systems with large RAM is correct, but there is another factor. TLB misses are expensive and since they involv

Everyone here saying paging is uncommon on modern systems with large RAM is correct, but there is another factor. TLB misses are expensive and since they involved MMU misses their effect is pretty analogous to paging. So slowdowns still exist but they're not quite as pronounced since each miss only costs you a few main memory accesses rather than going all the way to secondary storage. They do happen rather more often than paging though due to the small size of the TLB. From https://en.wikipedia.org/wiki/Translation_lookaside_buffer https://en.wikipedia.org/wiki/Translation_lookaside_buffer These are typical performance levels of a TLB: size: 12 bits – 4,096 entries hit time: 0.5 – 1 clock cycle miss penalty: 10 – 100 clock cycles miss rate: 0.01 – 1% (20–40% for sparse/graph applications) If a TLB hit takes 1 clock cycle, a miss takes 30 clock cycles, and the miss rate is 1%, the effective memory cycle rate is an average of 1 × 0.99 + (1 + 30) × 0.01 = 1.30 (1.30 clock cycles per memory access).