How to Speed Up MetaMask Transactions
Follow this guide if you're looking for an Infura alternative for Metamask.

Steps to update your Metamask

Why is Metamask not working?

MetaMask uses a default node provider to display and send transactions for your account. Because the node provider does not allocate dedicated resources to each user, it may be slow sometimes, i.e. for transaction broadcasting.
Alchemy provides a much better experience when it is used as your MetaMask RPC provider. If you'd like to switch this over to Alchemy to be able to see your transactions in your Alchemy dashboard and use Alchemy specific features and tools, this doc will show you how to integrate your MetaMask account in two easy steps.
NOTE: This does not mean that Alchemy will have access to your private keys or wallet!
For a video version of this guide, check this out:

Step 1: Create a free account on Alchemy​

We'll need to use an Alchemy API key to replace our Metamask endpoint. You can create a free account here.

Step 2: Create an API key for the desired Network on Metamask

If we want to replace our Ethereum Mainnet endpoint (most popular) in Metamask we'll need to create an Ethereum Mainnet API key on Alchemy. For instructions on how to do so, check out step 1 on this guide. Or watch the video below.

Step 3: Choose "Custom RPC" in Metamask

Navigate to your MetaMask wallet and click the network dropdown at the top, selecting "Custom RPC" at the bottom
Click on "Custom RPC" at the very bottom of the network dropdown.

Step 4: Fill in the network details

This is where you'll grab your Alchemy API Key for the desired network.
Here is the information on specific Netoworks:
Network
RPC Base URL
Chain ID
Block Explorer URL
Symbol (optional)
Ethereum Mainnet
1
ETH
Ropsten Test Network
3
ETH
Rinkeby Test Network
4
ETH
Goerli Test Network
5
ETH
Kovan Test Network
42
ETH
Polygon (Matic) Mainnet
137
MATIC
Example Polygon Configuration
Example Ethereum Mainnet Configuration
And thats it! Your MetaMask is now hooked up to Alchemy πŸŽ‰ You've now unlocked game changing tools like the Mempool Visualizer (where you can view all your transactions as they are being mined), Alchemy Notify (receive notifications about address activity, dropped/mined transactions, etc.), and more!