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

Apex , Winter 19

Last updated 2019-06-15 ·Reference W-5797321 ·Reported By 102 users

Fixed - Summer '19

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

Repro
1) In Workbench (https://workbench.developerforce.com), 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

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

Reported By (102)

Ketan Baluja Victor Hanson Jeff McKinnis Mario Lukica Bojan Zunko Brent Gossett Katelyn Montigney Janise Dismuke Matthias Greier Marty Kopka Siddharth Mathur Matthew Anderson 奏 山本 Tim Johnson Matt Behr Zainab shikari Arun Chockalingam Jon Scharff James Melville Konstantinos Vorilas David Esposito Shankar Dupade Dan Appleman Reynald Ocampo Daniel Rudman Leslie Linard Tuoyo Omadeli Sean Singer Hiroyuki Sawano Kevin Jones Christian Croce Daniel Wright Jesús González System Administrator Matthew Taylor Pedro Vallesquino Jeffrey Watkins Alberto Contreras Tamas Faludi Chris Howard Victor Garrido Matas Alex Miller Alejandro Molina Salazar Eeva Ilama Aníbal García García Paul Allen Rafa Torres Alvaro Martinez Campos Agustina Garcia System Administrator Tom Corbett Martyn Ellison Daniel Butler-Taverner Manuel Moya Paul Hardaker Paul Lawrence James Woodward Alberto David Fernández Stephen Willcock Philip Rowe José Andrés Vilchez Rocio Varo Angel Luis Pinar Valli Babu Barbara Pai Lina Tsin Daniel Ballinger Carl Chen 天勤 唐 Takahiro Kawabata 晃範 小野 伸也 羽田 anderson li yang yang Liang Cherry Brian Fear Leo Li Justin LaMont Eric Kintzer Jeff Hube Anne Shields Sean Singer James Browne Oliver Deighton Roberto Tomasoni Andrea Parimbelli Daniel Exposito Javier Labrat Dave Casper Luke Cotter Geoffrey Swift System Administrator Alex Lenthall Matthew Morris Javier Coca James Hadfield Jose Luis Martinez Michael Chadwick Sergio Salmerón Valerio Sevilla Bethany Kohler Jon Wilson

Is it Fixed?

AP0 AP3 AP4 AP5 AP6 AP7 AP8 AP9 AP14 AP15 AP20 AP21 AP22 AP28 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8 CS9 CS10 CS109 CS108 CS107 CS106 CS105 CS102 CS101 CS100 CS115 CS110 CS11 CS116 CS12 CS137 CS138 CS13 CS14 CS148 CS142 CS15 CS152 CS151 CS16 CS17 CS18 CS19 CS20 CS21 CS22 CS23 CS24 CS25 CS26 CS27 CS28 CS29 CS30 CS31 CS32 CS33 CS34 CS35 CS36 CS37 CS40 CS41 CS42 CS43 CS44 CS45 CS47 CS50 CS51 CS52 CS53 CS54 CS57 CS58 CS59 CS60 CS61 CS62 CS63 CS64 CS65 CS66 CS67 CS68 CS69 CS70 CS71 CS72 CS73 CS74 CS75 CS76 CS77 CS78 CS79 CS80 CS81 CS82 CS83 CS84 CS85 CS86 CS87 CS88 CS89 CS90 CS91 CS92 CS93 CS94 CS95 CS96 CS97 CS98 CS99 EU7 EU8 EU10 EU12 EU13 EU14 EU15 EU16 EU17 EU18 EU19 EU25 EU26 EU29 EU30 NA104 NA109 NA100 NA101 NA103 NA102 NA105 NA111 NA112 NA129 NA130 NA136 NA135 NA132 NA131 NA146 NA154 NA155 NA196 NA21 NA32 NA33 NA37 NA39 NA40 NA42 NA44 NA45 NA46 NA47 NA49 NA50 NA51 NA52 NA53 NA54 NA56 NA57 NA58 NA59 NA60 NA61 NA62 NA63 NA64 NA65 NA66 NA67 NA68 NA69 NA70 NA71 NA72 NA73 NA74 NA75 NA76 NA77 NA78 NA79 NA80 NA81 NA82 NA83 NA84 NA85 NA86 NA87 NA88 NA89 NA90 NA91 NA92 NA93 NA94 NA95 NA96 NA97 NA98 NA99 UM1 UM2 UM3 UM4 UM5

Any unreleased services, features, statuses, or dates referenced in this or other public statements are not currently available and may not be delivered on time or at all. Customers who purchase our services should make their purchase decisions based upon features that are currently available.