harmony 鸿蒙Overview of Concurrency in Time-Consuming Tasks

2025-06-06
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Overview of Concurrency in Time-Consuming Tasks

Time-consuming tasks are those that take a long time to complete. If executed in the UI main thread, they can cause application lag, frame drops, and slow response times. Typical examples include CPU intensive tasks, I/O intensive tasks, and synchronous tasks.

The following describes typical service scenarios for time-consuming tasks.

Service Scenario	Description	CPU Intensive Task	I/O intensive Task	Synchronous Task
Image/Video encoding and decoding	Encoding or decoding images or videos for display.	Supported	Supported	Not supported
Compression and decompression	Decompressing local archives or compressing local files.	Supported	Supported	Not supported
JSON parsing	Serializing and deserializing JSON strings.	Supported	Not supported	Not supported
Model computation	Performing data analysis using models.	Supported	Not supported	Not supported
Network download	Downloading resources, images, and files via intensive network requests.	Not supported	Supported	Not supported
Database operations	Saving data like chat records, page layouts, or music lists to the database, or reading from the database on application restart.	Not supported	Supported	Not supported