[Bug]: [milvus_client] Create a collection will take about 3 seconds on average

[NicoYuan1986]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

Create a collection will take about 3 seconds on average.

for example, client.create_collection(collection_name, dim=128).

Expected Behavior

shorten the time

Steps/Code To Reproduce behavior

No response

Environment details

- Hardware/Softward conditions (OS, CPU, GPU, Memory):
- Method of installation (Docker, or from source):
- Milvus version (v0.3.1, or v0.4.0):
- Milvus configuration (Settings you made in `server_config.yaml`):

Anything else?

No response

[NicoYuan1986]

@bigsheeper @yanliang567 @czs007 From the test results, ddl 5 rps will make great progress in create_collection. ddl 10 rps is similar to 5 rps. So ddl 5 may be better.