DEXs for the first time are seeing real user demand and Ethereum is currently the leading base layer blockchain for these interactions–seeing a considerable increase in ether gas as a result. However, without additional scaling solutions, this increased demand is and will continue to hamstring activity as costs have been driven up considerably on these trading venues. As a result of the increase in costs, small size trades on DEXs are currently prohibitively expensive. However, our analysis shows that at larger size, these transactions are still on par with centralized exchanges, which indicates that DEXs are more suited for large scale traders. If successful scaling solutions are implemented in the future, DEXs can become leading exchanges for both smaller size as well as larger size traders.

https://tradeblock.com/blog/an-analysis-of-ethereum-gas-fees-and-dex-costs