It’s hard to determine what’s going on with the amount of information you are providing.
Are you running in Release mode? Metal’s Debug mode is very slow.
If you are still having trouble, ZIP up your Xcode project, upload it to Dropbox (or similar site), post a link to it here, or email the link to firstname.lastname@example.org, and we’ll download your app and have a look at it.
You are not providing enough information for us to help you. There are many reasons why the application may be running slower, including those answered in your other post. Are you able to post your app somewhere, as requested in the previous post?
In the numbers you do provide above, MetalGL‘s CPU performance is substantially better than OpenGLES, as it should be. MetalGL is designed to improve CPU performance, as discussed in the README-UserGuide document.
From your numbers above, your performance bottleneck appears to be in the shaders. It is possible that the automatic conversion of one or more of your shaders has resulted in inefficient Metal Shading Language (MSL) code. You can tune the shaders once they have been converted to MSL and load them directly as MSL code. An explanation of how to do this is in the README-UserGuide document as well.