The best replacement for l1 is l2 cache.

The best alternatives to l1 are rated as following:
★★★★★  l2 cache
★★★★  l2
★★★  h1b
★★  e2 visa
★  h1
★  h1 visa
★  tn visa
★  l3
  fishman solo
  eb1
  l2 waves
  h1b visa
  l3 cache
  b1

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