Performance issue while loading time entries via Rest API in OIC

Summary:

We are facing significant performance issue when loading time entries through the Rest API in OIC. Its taking around 1hr to load 2.5k records, but the expected volume is 45k records and at this rate it will take around 20hrs which is not feasible.
Any insights or suggestions from the community would be greatly appreciated and pls let me know if anyone has done time entry load through API in OIC.

Content (please ensure you mask any confidential information):

Rest API URL: /hcmRestApi/resources/11.13.18.05/timeRecordEventRequests
Payload:

{

"processMode": "TIME_SAVE",
"processInline":"Y",
"timeRecordEvent":
[{
"timeRecordId":"",
"timeRecordVersion":"",
"startTime":"2024-08-14T00:00:00.000-00:00",