diff --git a/src/main/java/org/gitlab4j/api/GroupApi.java b/src/main/java/org/gitlab4j/api/GroupApi.java
index b50feae9ef87101666828d0c767d47c9c1dbcece..380e75adb83a8d24248026b8d549015cf4575590 100644
--- a/src/main/java/org/gitlab4j/api/GroupApi.java
+++ b/src/main/java/org/gitlab4j/api/GroupApi.java
@@ -33,7 +33,11 @@ public class GroupApi extends AbstractApi {
     }
 
     /**
-     * Get a list of groups. (As user: my groups, as admin: all groups)
+     * <p>Get a list of groups. (As user: my groups, as admin: all groups)</p>
+     *
+     * <strong>WARNING:</strong> Do not use this method to fetch groups from https://gitlab.com,
+     * gitlab.com has many 1,000's of public groups and it will a long time to fetch all of them.
+     * Instead use {@link #getGroups(int itemsPerPage)} which will return a Pager of Group instances.
      *
      * <pre><code>GitLab Endpoint: GET /groups</code></pre>
      *
@@ -41,6 +45,13 @@ public class GroupApi extends AbstractApi {
      * @throws GitLabApiException if any exception occurs
      */
     public List<Group> getGroups() throws GitLabApiException {
+
+        String url = this.gitLabApi.getGitLabServerUrl();
+        if (url.startsWith("https://gitlab.com")) {
+            GitLabApi.getLogger().warning("Fetching all groups from " + url +
+                    " may take many minutes to complete, use Pager<Group> getGroups(int) instead.");
+        }
+
         return (getGroups(getDefaultPerPage()).all());
     }
 
diff --git a/src/main/java/org/gitlab4j/api/ProjectApi.java b/src/main/java/org/gitlab4j/api/ProjectApi.java
index 59310a7f60096849078e2e811f2355bf41c58207..a7e39640fe4a5d32a004dc59bfec49c226278cba 100644
--- a/src/main/java/org/gitlab4j/api/ProjectApi.java
+++ b/src/main/java/org/gitlab4j/api/ProjectApi.java
@@ -67,7 +67,11 @@ public class ProjectApi extends AbstractApi implements Constants {
     }
 
     /**
-     * Get a list of projects accessible by the authenticated user.
+     * <p>Get a list of projects accessible by the authenticated user.</p>
+     *
+     * <strong>WARNING:</strong> Do not use this method to fetch projects from https://gitlab.com,
+     * gitlab.com has many 100,000's of public projects and it will take hours to fetch all of them.
+     * Instead use {@link #getProjects(int itemsPerPage)} which will return a Pager of Project instances.
      *
      * <pre><code>GET /projects</code></pre>
      *
@@ -75,6 +79,13 @@ public class ProjectApi extends AbstractApi implements Constants {
      * @throws GitLabApiException if any exception occurs
      */
     public List<Project> getProjects() throws GitLabApiException {
+
+       String url = this.gitLabApi.getGitLabServerUrl();
+       if (url.startsWith("https://gitlab.com")) {
+           GitLabApi.getLogger().warning("Fetching all projects from " + url +
+                   " may take many hours to complete, use Pager<Project> getProjects(int) instead.");
+       }
+
        return (getProjects(getDefaultPerPage()).all());
     }
 
diff --git a/src/main/java/org/gitlab4j/api/UserApi.java b/src/main/java/org/gitlab4j/api/UserApi.java
index 4e179b042cb34608e461ff198ab78a5e4e2833d0..17772dca1346093abad68ff1fada723fa157c9ed 100644
--- a/src/main/java/org/gitlab4j/api/UserApi.java
+++ b/src/main/java/org/gitlab4j/api/UserApi.java
@@ -47,7 +47,11 @@ public class UserApi extends AbstractApi {
     }
 
     /**
-     * Get a list of users.
+     * <p>Get a list of users.</p>
+     *
+     * <strong>WARNING:</strong> Do not use this method to fetch users from https://gitlab.com,
+     * gitlab.com has many 1,000,000's of users and it will a long time to fetch all of them.
+     * Instead use {@link #getUsers(int itemsPerPage)} which will return a Pager of Group instances.
      *
      * <pre><code>GitLab Endpoint: GET /users</code></pre>
      *
@@ -55,6 +59,13 @@ public class UserApi extends AbstractApi {
      * @throws GitLabApiException if any exception occurs
      */
     public List<User> getUsers() throws GitLabApiException {
+
+        String url = this.gitLabApi.getGitLabServerUrl();
+        if (url.startsWith("https://gitlab.com")) {
+            GitLabApi.getLogger().warning("Fetching all users from " + url +
+                    " may take many minutes to complete, use Pager<User> getUsers(int) instead.");
+        }
+
         return (getUsers(getDefaultPerPage()).all());
     }