We are aware that file sharing is significantly slower than it needs to be to provide a native-like experience and we are approaching the volume mount performance issue from multiple angles. Beta 8 will include improvements to sequential read and write throughput and possibly other aspects of file sharing. We hope to have major performance improvements in the coming beta releases. Watch the changelog for news!
If you would like to help out our performance engineering efforts, we’d really appreciate an easily reproducible and representative macro benchmark for your use case. Is there a specific use case that you’d like us to attempt to optimize? You mentioned symfony2 development; could you provide a Dockerfile or script so that we can add it to our collection of performance benchmarks?