# Useing a RamDisk for the asynchronous-upload-folder

**URL:** https://forum.duplicati.com/t/useing-a-ramdisk-for-the-asynchronous-upload-folder/5735
**Category:** Developer
**Created:** [December 21, 2018, 4:34pm UTC](https://forum.duplicati.com/t/useing-a-ramdisk-for-the-asynchronous-upload-folder/5735 "2018-12-21T16:34:07Z")
**Posts on this page:** 1
**Showing post:** 5

<div class="post-metadata">

### Author: ![ts678](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/t/8491ac/32.png) [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [December 24, 2018, 7:57pm UTC](https://forum.duplicati.com/t/useing-a-ramdisk-for-the-asynchronous-upload-folder/5735/5 "2018-12-24T19:57:18Z")

</div>

> [@NotHere](#):
>
> I had thought this was the purpose of --use-block-cache

I think the block cache is an in-memory copy of the SQLite Block table meant to shorten a [lookup](https://github.com/duplicati/duplicati/blob/d73700a508c93f0e15c85ea851605eaebde75637/Duplicati/Library/Main/Database/LocalBackupDatabase.cs#L393) whether a data block read from a file being backed up was backed up already. If so, it doesn’t require another backup.

[https://forum.duplicati.com/search?q=use-block-cache](https://forum.duplicati.com/search?q=use-block-cache) found a few mentions, with one of the better ones at:

[Duplicati 2 vs. Duplicacy 2](https://forum.duplicati.com/t/duplicati-2-vs-duplicacy-2/592/55)

> I have just tested with a small backup (~2000 blocks), and a block lookup cache had a tiny positive effect on the backup speed. But it is possible that this speedup is much more pronounced with larger backups, so I made a canary build with the option `--use-block-cache` . If it turns out that it really does improve performance without ridiculous memory overhead, I will convert it to a `--disable-block-cache` option.

[v2.0.2.6-2.0.2.6\_canary\_2017-09-16](https://github.com/duplicati/duplicati/releases/tag/v2.0.2.6-2.0.2.6_canary_2017-09-16)

> Added an experiemental --use-block-cache flag to test performance potential

---

_[View the full topic](https://forum.duplicati.com/t/useing-a-ramdisk-for-the-asynchronous-upload-folder/5735)._