src/vs/editor/browser/controller/mouseHandler.ts/TopBottomDragScrollingOperation/_getScrollSpeed
class TopBottomDragScrollingOperation:	private _getScrollSpeed(): number {
		const lineHeight = this._context.configuration.options.get(EditorOption.lineHeight);
		const viewportInLines = this._context.configuration.options.get(EditorOption.layoutInfo).height / lineHeight;
		const outsideDistanceInLines = this._position.outsideDistance / lineHeight;

		if (outsideDistanceInLines <= 1.5) {
			return Math.max(30, viewportInLines * (1 + outsideDistanceInLines));
		}
		if (outsideDistanceInLines <= 3) {
			return Math.max(60, viewportInLines * (2 + outsideDistanceInLines));
		}
		return Math.max(200, viewportInLines * (7 + outsideDistanceInLines));
	}