# Estimate Tezos performances (DEPRECATED)

## NFT transfer performances

At the time of writing (February 2022, Hangzhou): 

* a typical NFT transfer on Tezos consumes**¹** 2,691 gas units per transaction, 
* the Tezos maximum block gas limit is 5,200,000 gas units, 
* the block time is 30 seconds. 

To maximize throughput, we can use batching - grouping several transactions into a single block. 

We performed experiments and measured how gas consumption varies depending on how many NFT transfers we group into a single batch of transactions, as presented in the following experimental values table:

| Batch size | Gas consumed |
| ---------- | ------------ |
| 1          | 2,691        |
| 10         | 9,601        |
| 100        | 78,709       |
| 240        | 186,213      |
| 300        | 232,285      |
| 400        | 309,074      |
| 500        | 385,863      |
| 600        | 462,653      |
| 650        | 501,048      |

We had to stop at 650, because we had reached the operation size limit imposed by the protocol. Thus, the largest batch we can use is 650. Now we estimate how many batches we can have in a block, considering that the max block gas limit is 5,200,000 gas units:

$$
\text{Max batches} = \frac{5,200,000}{501,048} \approx 10
$$

We now need to process the leftover gas:

$$
\text{Leftover gas} = 5,200,000 - (10 \times
501,048) \approx 189,520
$$

By taking this value and comparing it to our experimental values table we can see that we can add an extra batch of 240 NFT transfers approximately.

That would make the total of NFT transfers per block equal to:

$$
\text{Max NFT
transfers per block} = (10 \times 650) + (1 \times 240) = 6,740
$$

Since we have two blocks per minute, the number of transactions per second would be:

$$
\frac{6,740}{30} \approx 224 \ \text{NFT transfer/second}
$$

## Standard Tez transfer performances

For standard tez transfers, we can process the performance of the Tezos blockchain with the following formula:

$$
\frac{\text{max gas per block}}{\text{tx gas consumption} \times \text{time per
block}} = \text{tx/second}
$$

In that scenario, the gas consumption is 1,420 gas units, and we will keep the same values as in the previous calculation:

* Tezos maximum block gas limit: 5,200,000 gas units 
* Block time: 30 seconds.

$$
\frac{5,200,000}{1,420 \times 30} \approx 122\ \text{tx/second}
$$

Performance should improve further with the planned Tezos upgrade to adopt the Tenderbake consensus algorithm **²**, and the Hangzhou amendment.

**\[1]:** With the minimal contract implementing the FA2 standard.

**\[2]:** <https://blog.nomadic-labs.com/a-look-ahead-to-tenderbake.html>