# Trading Settings Guide

## Purchase Priority Fee

* The **purchase priority fee**, or **gas priority fee**, significantly impacts the speed of transaction confirmation during buying. To accelerate the confirmation process, users can set various levels of gas priority fees, including standard, fast, and ultra-fast options.
* For users seeking quick transactions, the standard gas priority fee can be set to 0.00025 SOL, the fast option to 0.0005 SOL, and the ultra-fast can be elevated to 0.002 SOL or higher. Actual gas priority fees can be customized according to trading preferences.

## Selling Priority Fee

* Similarly, the **selling gas priority fee** also significantly affects the speed of transaction confirmations. Like buying settings, the gas fees for selling transactions can be customized based on user needs.
* For rapid transactions, we recommend setting the standard gas priority fee at 0.00025 SOL, fast at 0.0005 SOL, and ultra-fast at 0.002 SOL or higher, adjustable according to individual trading habits.

## Slippage Tolerance

* **Slippage tolerance** refers to the allowable difference between the expected price and the actual execution price, with a variance factor = 1/(1 - slippage). For example, a 50% slippage tolerance means accepting up to a 2x price difference, while 100% indicates no limit on the price gap.
* Slippage controls the range of price variation you are willing to accept upon trade execution. uGun currently supports a high-speed mode, allowing slippage settings from 0% to 100%.
* In high-speed trading modes, it is advisable to set lower slippage to avoid potential sandwich attacks.