# Why does the duration of submitting some transactions to the Algorand private network change?

**URL:** <https://forum.algorand.co/t/why-does-the-duration-of-submitting-some-transactions-to-the-algorand-private-network-change/9757>\
**Category:** Uncategorized\
**Created:** [June 8, 2023, 8:36pm UTC](https://forum.algorand.co/t/why-does-the-duration-of-submitting-some-transactions-to-the-algorand-private-network-change/9757 "2023-06-08T20:36:30Z")\
**Posts on this page:** 1\
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**Author:** ![sahand](https://avatars.discourse-cdn.com/v4/letter/s/439d5e/32.png) [@sahand](https://forum.algorand.co/u/sahand)\
**Post date:** [June 13, 2023, 8:06pm UTC](https://forum.algorand.co/t/why-does-the-duration-of-submitting-some-transactions-to-the-algorand-private-network-change/9757/7 "2023-06-13T20:06:58Z")

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I understand that Algorand is able to handle a lot of transaction in less that 4s. That is why I didn’t understand what is happening in my private network.  
Just to be clear, I didn’t say that it takes 0.5s for the first transaction. I am not in dev mode, so my network waits for the next round to create a new block and each round takes around 4 seconds. It takes 40 seconds when I send 90 transactions to the network and wait to get the last confirmation. But the next time I run the experiment and send another 90 transactions, it takes around 40.5 seconds to receive the last confirmation. And if I run the same experiment 10 times more, it would take around 45s.  
After I set the flag, I do ./sanbox down dev and then clean. Then I start the network again.

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