Did you try preventing animation of the Chart to see if that has any effect? I.e. this.chart.update("none");
I use Chart.js with LV (example: assets/js/frontend/profile/graphs/last-weeks.component.js · ea44484f605c905060e1973a10d8ef53daa43d90 · CodeStats / code-stats · GitLab) and I’ve had no such delay issue (though I transfer my data in a different way).
