Game lag consistently

Is it possible to fix the stuttering CONSISTENT lag I keep having while playing HOTS ?
WTF is that. Haven’t played for months, wanted to come back to that game and to be honest, it’s completely unplayable. Things just keep disappearing, and lagging every 5 seconds for 1 second. Wtf is going on here ???

MacBook Pro (Retina, 15-inch, Mid 2015)
Processor 2.2 GHz Quad-Core Intel Core i7
Memory 16 GB 1600 MHz DDR3
Graphics Intel Iris Pro 1536 MB

NEED SOME HELP.
Thanks

A post was merged into an existing topic: Visual bugs since latest patch