High response time for Zendesk APIs

We are using Zendesk APIs to fetch the tickets and its fields to show it in our CARS24 app. Please find the attached image of flowchart

 

 

This API is taking somewhere between 500ms to 1.2 seconds, which as an impact increases our api latency.

Our SLA is supposed to be below 100ms.
Please let us know how we can improve the api latency of search.json.

 

Example Queries

1. form:"care.direct" custom_field_360006319715:"09DEQS" custom_field_360013025656:"yes_-_reimbursement_opted_by_customer"

2. form:"care.direct" custom_field_360006319755:"43b72574-b31e-4efc-8c84-451889555806"

3. zendesk query: form:"care.direct" custom_field_360006319715:"EX3PX7" custom_field_360005941295:"delivered"

4. form:"care.direct" custom_field_360006319715:"887RDI" custom_field_360005941295:"delivered" custom_field_360006190896:"car_return_request"