Not sure what is wrong but it a bit slow.

[namkazt]

BenchmarkLRUByteHashSet-12              53083549                22.0 ns/op             5 B/op          0 allocs/op
BenchmarkLRUSet-12                      12577149                96.6 ns/op           106 B/op          3 allocs/op
BenchmarkBigCacheSet-12                  9351686               126 ns/op              71 B/op          0 allocs/op
BenchmarkLRUByteHashGet-12              107372199               11.0 ns/op             2 B/op          0 allocs/op
BenchmarkLRUGet-12                      59989704                20.1 ns/op             5 B/op          0 allocs/op
BenchmarkBigCacheGet-12                 18905139                63.2 ns/op             2 B/op          2 allocs/op

func BenchmarkBigCacheGet(b *testing.B) {
	cache, _ := bigcache.NewBigCache(bigcache.Config{
		Shards:       256,
		LifeWindow:   10 * time.Minute,
		MaxEntrySize: 256,
		Verbose:      false,
	})
	cache.Set("1", []byte("1"))
	for n := 0; n < b.N; n++ {
		cache.Get("1")
	}
}
func BenchmarkBigCacheSet(b *testing.B) {
	cache, _ := bigcache.NewBigCache(bigcache.Config{
		Shards:       256,
		LifeWindow:   10 * time.Minute,
		MaxEntrySize: 256,
		Verbose:      false,
	})
	for n := 0; n < b.N; n++ {
		cache.Set("1", []byte("1"))
	}
}