# Insert of large JSON data for Cassandra driver very slow

**URL:** https://forum.yugabyte.com/t/insert-of-large-json-data-for-cassandra-driver-very-slow/469
**Category:** General
**Created:** [August 19, 2019, 5:41am UTC](https://forum.yugabyte.com/t/insert-of-large-json-data-for-cassandra-driver-very-slow/469 "2019-08-19T05:41:45Z")
**Posts on this page:** 1
**Showing post:** 9

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### Author: ![Alan\_Caldera](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.yugabyte.com/alan_caldera/32/91_2.png) [@Alan\_Caldera](https://forum.yugabyte.com/u/Alan_Caldera)
#### Post date: [August 20, 2019, 1:46pm UTC](https://forum.yugabyte.com/t/insert-of-large-json-data-for-cassandra-driver-very-slow/469/9 "2019-08-20T13:46:51Z")

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Thanks for posting that information. I would recommend that you increase the amount of memory assigned by editing line 35 in `yb-docker-ctl` from:

```auto
   MEM_LIMIT_BYTES = 1024 * 1024 * 1024

```

to

```auto
   MEM_LIMIT_BYTES = 8 * 1024 * 1024 * 1024

```

This will increase the sizes of other tunables and should help improve performance.  
Hope this helps.  
–Alan

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