Which is an abstract concept anyway. How much is too much?It does however sound like too much immigration.
Immigration in Canada - and Australia and New Zealand - is economically planned out by the government to compensate for a failing birth rate and aging population. So optimum levels in that sense might conflict with existing services and accommodations.
That involves a balancing of resources; but it's not "too much immigration" in the sense that a far right rioter in the UK might conceive the notion.