Queue blocked, champ select blocked, chat blocked and laggy client UI generally.

Second time this week I got queue blocked because the client UI lagged out.

Happens a lot with different problems eventuating from, what seems like, the same issue.

I'm in champ select and the whole UI is laggy by a number of seconds. Anytime I click on something it takes about 2 seconds to register, that's find I can deal with that. But often the UI just laggs out fully and I'm left with a frozen screen or unable to click buttons.

problems that constantly arise from this:

• I can't select a champ so after a minute it thinks I dodged so I get queue blocked.
• I can't see or chat in chat
• I can't select champs or ban champs
• I can't use the search box
• I can't select rune page
• Screen freezes 'match accepted'
• Screen freezes on anything really.
• audio sounds not synced, ever..
• Screen glitches and flashes in the corners
• 1-2 second lag on every click

plus many more problems I can't remember. The issue is the laggy UI, it's never been good, but it getting worse.

I'm running on a macbook 2015 model, fully updated. No other programs running etc.