Jitsi iFrame API performance issues

I’ve been using Jitsi Meet iFrame API on my site, however now the connection is established quite slowly, and the video and sound are lagging. Here is my config:

       var domain = "meet.jit.si";
        var options = {
            roomName: room,
            parentNode: document.querySelector('#bigscreen'),
            userInfo: {
                displayName: m
            configOverwrite: {
                prejoinPageEnabled: false,
                // startAudioOnly: false,
                startWithVideoMuted: false,
                enableNoisyMicDetection: false,
                enableClosePage: true,
                disableDeepLinking: true,
            interfaceConfigOverwrite: {
                // DEFAULT_LOGO_URL: 'battery.png',
                'TOOLBAR_BUTTONS': [],
                SHOW_JITSI_WATERMARK: false,
                VIDEO_QUALITY_LABEL_DISABLED: true,
                SHOW_JITSI_WATERMARK: false,
                HIDE_DEEP_LINKING_LOGO: true,
        myapi = new JitsiMeetExternalAPI(domain, options);

What could be the issue, or what could I tweak in the options to mitigate the lag, and to make the connection establish faster?