Apex SObject Describes performance testing

anonymousApex.cls

String objectName = 'Account';
SObjectType sObjecType = Account.SObjectType;
Account record = new Account();
List<String> names = new List<String> { objectName };

Integer iterations = 50000;

static Long logTime = Limits.getCpuTime();
static void log(String text) {
	System.debug(LoggingLevel.ERROR, (Limits.getCpuTime() - logTime) + ' - ' + text);
	logTime = Limits.getCpuTime();
}

log('start');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = sObjecType.getDescribe();
}
log('sObjecType.getDescribe()');

Map<String, SObjectType> types = Schema.getGlobalDescribe();
for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = types.get(objectName).getDescribe();
}
log('Global Describe (stored in anonymous Apex)');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = GlobalDescribe.TYPES.get(objectName).getDescribe();
}
log('Global Describe (stored in a class)');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = record.getSObjectType().getDescribe();
}
log('record.getSObjectType().getDescribe()');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = GlobalDescribe.get(objectName);
}
log('Cached DescribeResult (stored in class after first request)');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = Account.SObjectType.getDescribe();
}
log('Account.SObjectType.getDescribe()');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = SObjectType.Account;
}
log('SObjectType.Account');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = GlobalDescribe.uncached(objectName);
}
log('Global Describe (stored in a class, describe not cached)');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = types.get(''+Account.SObjectType).getDescribe();
}
log('stringified Account.SObjectType with anonymous Global Describe');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = GlobalDescribe.type(objectName).getDescribe();
}
log('Cached SObjectType retrieved by accessor method, then call .getDescribe()');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = fflib_SObjectDescribe.getDescribe(objectName).getDescribe();
}
log('fflib_SObjectDescribe.getDescribe(objectName).getDescribe()');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult describeResult = Schema.describeSObjects(names)[0];
}
log('Schema.describeSObjects(objectName)');

for (Integer i = 0; i < iterations; i++) {
	DescribeSObjectResult d = ((SObject) Type.forName('Schema', objectName).newInstance()).getSObjectType().getDescribe();
}
log('Type.forName(\'Schema\', objectName)');

GlobalDescribed.cls

public with sharing class GlobalDescribe {
	public static Map<String, SObjectType> TYPES = Schema.getGlobalDescribe();
	public static Map<String, DescribeSObjectResult> DESCRIBES = new Map<String, DescribeSObjectResult>();
	
	public static SObjectType type(String name) {
		return TYPES.get(name);
	}
	
	public static DescribeSObjectResult get(String name) {
		if(!DESCRIBES.containsKey(name)) {
			DESCRIBES.put(name, type(name).getDescribe()); // consider using SObjectDescribeOptions.FULL if needed
		}
		
		return DESCRIBES.get(name);
	}
	
	public static DescribeSObjectResult uncached(String name) {
		return TYPES.get(name).getDescribe();
	}
}

GlobalDescribed.cls-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>53.0</apiVersion>
    <status>Active</status>
</ApexClass>