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You may probably experience some performance gains by upgrading your hardware but you need to keep few things in mind.
Before purchasing a new MacBook you can analyse few areas , I am not sure the actual reason of the performance issue (it can be a network issue as well )
Below links should help you to analyse the same.
2) Performance recording can also help you to analyse and drill-down to the actual issues.
All the best !
Thanks for your input and the article. I will give it a look.