You have 2 common options:
-
Display your points in a Canvas-based layer, like using Circle Markers and force rendering them on a Canvas instead of SVG (see also Leaflet MaskCanvas plugin). Circle Markers, even on a canvas, still emit events, so you can detect
"click"etc. -
Use a clustering plugin, like Leaflet.markercluster plugin that you mention for exampe. It can handle your 140k points, depending on the client’s computer performance (see https://github.com/Leaflet/Leaflet.markercluster#handling-lots-of-markers and demo http://leaflet.github.io/Leaflet.markercluster/example/marker-clustering-realworld.50000.html with 50k points, but note that the demo uses an old version of the plugin, whereas the current version is even faster).
Trying to display your 140k points without Canvas or clustering will crash your browser for sure.