hush3/doc/reducing-memory-usage.md

# In-memory caches

The size of some in-memory caches can be reduced. As caches trade off memory usage for performance, usually reducing these have a negative effect on performance.

- `-dbcache=<n>` - the UTXO database cache size, this defaults to `450` (`100` before 1.0.15). The unit is MiB (where 1 GiB = 1024 MiB).
  - The minimum value for `-dbcache` is 4.
  - A lower dbcache make initial sync time much longer. After the initial sync, the effect is less pronounced for most use-cases, unless fast validation of blocks is important such as for mining.
update docs 3 years ago			`# In-memory caches`
Add documentation about dbcache. Adapted from documentation 'Reducing bitcoind memory usage' by @laanwj https://gist.github.com/laanwj/efe29c7661ce9b6620a7 6 years ago
			`The size of some in-memory caches can be reduced. As caches trade off memory usage for performance, usually reducing these have a negative effect on performance.`

			- `-dbcache=<n>` - the UTXO database cache size, this defaults to `450` (`100` before 1.0.15). The unit is MiB (where 1 GiB = 1024 MiB).
			- The minimum value for `-dbcache` is 4.
			`- A lower dbcache make initial sync time much longer. After the initial sync, the effect is less pronounced for most use-cases, unless fast validation of blocks is important such as for mining.`