SObjectType.getDescribe() and SObjectField.getDescribe() increase Apex CPU consumption in API version 44+

SObjectType.getDescribe() and SObjectField.getDescribe() increase Apex CPU consumption in API version 44+

Apex , Winter 19

Last updated 6 days ago ·Reference W-5797321 ·Reported By 77 users

Scheduled - Summer '19

SObjectType.getDescribe() and SObjectField.getDescribe() consume more Apex CPU time if API version is 44.0 or above.

1) In Workbench (, set the API version to 43.0, and run an the following Apex code in an anonymous block:

Map<String, Schema.SObjectType> globalDescribe = Schema.getGlobalDescribe();
for(Schema.SObjectType objectType : globalDescribe.values()) {
Schema.DescribeSObjectResult objDescribe = objectType.getDescribe();
for(Schema.SObjectField fieldType : objDescribe.fields.getMap().values()) {
Schema.DescribeFieldResult fieldDescribe = fieldType.getDescribe();
System.debug('CPU Time: ' + Limits.getCpuTime());
System.debug('Number of Entities: ' + globalDescribe.size());

You'll see an output similar to the one shown below:

|USER_DEBUG|[8]|DEBUG|CPU Time: 2559
|USER_DEBUG|[9]|DEBUG|Number of Entities: 548

2) Then, change the API version to 44.0, and run the code again. You'll see it consumes about 5 times more Apex CPU time in 44.0 even though the number of entities doesn't increase substantially.

|USER_DEBUG|[8]|DEBUG|CPU Time: 12351
|USER_DEBUG|[9]|DEBUG|Number of Entities: 558

Change the affected Apex class' API version to 43.0 or below.

Is it Fixed?

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