export interface IPerformanceMetrics {
    loadTime: number;
    fullLoadTime: number;
    fps: number;
    percentDroppedFrames: number;
}
export declare const PerformanceMarkers: {
    create: string;
    load: string;
    fullLoad: string;
};
export declare const PerformanceUtils: {
    mark(marker: string): void;
    frame(timestamp: number): void;
    clearMetrics(): void;
    getPerformanceMetrics(): IPerformanceMetrics;
};