The best replacement for 4mb is 2mb cache.

The best alternatives to 4mb are rated as following:
★★★★★  2mb cache
★★★★★  unifi 5mb
★★★★  6mb
★★  8mb
★★  2mb
★  3mb cache
★  3mb l2 cache
  250mb
  2mb l2 cache

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4mb
2mb cache
unifi 5mb