[Feature Request]: <title>speed up merge node with parallel

[TonicZhang]

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Feature Request Description

Preliminary testing shows that the speed bottleneck is at the merge node stage. Is it possible to optimize this by changing to a concurrent merge?
Can I remove the “await” and use “create_task” and “gather” in the following code? Was the use of await here because some graph databases, like NetworkX, do not support concurrent node insertion, so everything was changed to a serial mode?

[danielaskdd]

Too many concurrent requests can generate excessive database connections, consuming a large amount of resources and leading to a performance decline. The correct approach is to use batch mode for data queries. The main branch has already been optimized following this principle. Currently, the performance of PostgreSQL and Neo4j has been significantly improved.