Ask for document or window access post response.

browser-pref question

var canada_bcs = [
"CAE-B1N",  "CAE-B2N",  "CAE-B3N",  "CAE-B4N",  "CAE-B5N",  "CAE-B6N",  "CAE-B7N",  "CAE-B8N",  "CAE-B9N",  "CAE-BAN",  "CAE-BBN",  "CAE-BCN",  "CAE-BDN",  "CAE-BEN",  "CAE-BFN",  "CAE-BGN",  "CAE-BHN",  "CAE-BIN",  "CAE-BJN",  "CAE-T1N",  "CAE-T2N",  "CAE-T3N",  "CAE-T4N",  "CAE-T5N",  "CAE-T6N",  "CAE-T7N",  "CAE-T8N",  "CAE-T9N",  "CAE-TAN",  "CAE-TBN",  "CAE-TCN",  "CAE-TDN",  "CAE-TDN",  "CAE-TEN",  "CAL-T1N",  "CAP-B1N",  "CAP-B3N",  "CAP-B4N",  "CAP-B5N",  "CAP-B6N",  "CAP-B7N",  "CAP-B8N",  "CAP-B9N",  "CAP-BAN",  "CAP-BBN",  "CAP-BCN",  "CAP-BDN",  "CAP-BEN",  "CAP-BFN",  "CAP-BGN",  "CAP-BHN",  "CAP-BHN",  "CAP-T1N",  "CAP-T2N",  "CAP-T3N",  "CAP-T4N",  "CAP-T5N",  "CAP-T6N",  "CAP-T7N",  "CAP-T8N",  "CAP-T9N",  "CAP-TAN",  "CAP-TBN",  "CAP-TCN",  "CAP-TDN",  "CAP-TEN",  "CAP-TFN",  "CAP-TGN",  "CAP-THN",  "CAP-TIN",  "CAP-TJN",  "CAS-B3N",  "CAS-B4N",  "CAS-B5N",  "CAS-B6N",  "CAS-B7N",  "CAS-B8N",  "CAS-B9N",  "CAS-BAN",  "CAS-BBN",  "CAS-BCN",  "CAS-FRE",  "CAS-T1N",  "CAS-T2N",  "CAS-T3N",  "CAS-T4N",  "CAS-T5N",  "CAS-T6N",  "CAS-T7N",  "CAS-T8N",  "CAS-TAN",  "CAS-TBN",  "CAS-TCN",  "OBI-LL4",  "OBI-LL5",  "OBI-LL6"
]
var bcs_response = []
var browserPerf = require('browser-perf');

var options = {
    actions: [
        // scroll first,
        function() {
        	return function(browser) {
        	console.log(browser);              
            }
        }()
    ],
} 

function loop() {
	var bcs_res = {}
	bcs_res.bc = canada_bcs.shift()
	if ( bcs_res.bc ) {
		try { 
			bcs_res.url = 'https://quickbooks.intuit.ca/signup/buy?bc=' + bcs_res.bc + '&preview=true'
			browserPerf(bcs_res.url, function (err, res) {
				console.log(err);
				bcs_res.loadTime = res[0].loadTime;
				setTimeout(function () {
					bcs_response.push(bcs_res)
					loop();
					console.log('response length:', bcs_response.length, 'remaining:', canada_bcs.length)
				}, 500)
			}, options)
		} catch (err) {
			console.log(err, 'response length:', bcs_response.length, 'remaining:', canada_bcs.length)
			loop();			
		}
	} else {
		console.log(bcs_response)
	}
}
loop()

I think that would be better as 2 different tests. This way, one test will not interfere with the other. You simply need a scroll test, and a page load test.