Yes, there is often a limit on the number of messages displayed in the notification bar, depending on the operating system and device settings.
For example, on Android devices, the notification shade typically shows a limited number of recent notifications (e.g., the latest 5–10), while older ones may be collapsed or hidden. On iOS, notifications are grouped by app, and only the most recent ones are displayed unless the user expands the group.
In cloud-based notification systems (e.g., push notification services), the limit may also depend on the backend configuration. For instance, if you're using a push notification service with Tencent Cloud, the number of messages displayed in the notification bar is managed by the device's OS, but the service itself can handle high volumes of notifications. Tencent Cloud's Push Service allows developers to send targeted notifications efficiently while respecting platform-specific display rules.
To optimize notification delivery, developers can use features like message grouping, priority settings, or silent notifications to ensure important messages are seen.