diff --git a/src/models/database/guild-storage.ts b/src/models/database/guild-storage.ts
index 1ed743d..9906d6e 100644
--- a/src/models/database/guild-storage.ts
+++ b/src/models/database/guild-storage.ts
@@ -12,7 +12,7 @@ export interface IGuildStorage extends Document {
 }
 
 export const GuildStorageSchema = new Schema({
-  guildId: { type: Schema.Types.String, required: true },
+  guildId: { type: Schema.Types.String, required: true, index: true },
 
   majorImplements: {
     type: Map,
diff --git a/src/models/database/user.ts b/src/models/database/user.ts
index 0023736..0e7d5ac 100644
--- a/src/models/database/user.ts
+++ b/src/models/database/user.ts
@@ -24,8 +24,8 @@ export interface IUserCourseAssignment {
 }
 
 export const UserSchema = new Schema({
-  discordUserId: { type: Schema.Types.String, required: true, unique: true },
-  studentId: { type: Schema.Types.String, required: false },
+  discordUserId: { type: Schema.Types.String, required: true, unique: true, index: true },
+  studentId: { type: Schema.Types.String, required: false, index: true },
   verificationStatus: { type: Schema.Types.Number, required: true, default: VerificationStatus.UNVERIFIED },
   verificationCode: { type: Schema.Types.String, required: false },
 
diff --git a/src/services/database/guild-storage.ts b/src/services/database/guild-storage.ts
index c617532..be226ee 100644
--- a/src/services/database/guild-storage.ts
+++ b/src/services/database/guild-storage.ts
@@ -1,5 +1,5 @@
 import { GuildContext } from "guild-context";
-import { Course, PartialCourse } from "models/course";
+import { PartialCourse } from "models/course";
 import { GuildStorage, IGuildStorage } from "models/database/guild-storage";
 import { ICourseImplement } from "models/implement/course";
 import { IMajorImplement } from "models/implement/major";
@@ -7,24 +7,42 @@ import { IVerificationImplement } from "models/implement/verification";
 import { Major } from "models/major";
 
 export class GuildStorageDatabaseService {
+  private static CACHE: {[guildId: string]: IGuildStorage} = {}
+
   public static async findOrCreateGuildStorage(guildContext: GuildContext): Promise<IGuildStorage> {
+    // Check cache.
+    let storage = this.CACHE[guildContext.guild.id];
+    if(storage) {
+      return storage;
+    }
+
     // Find existing storage.
-    let storage = await GuildStorage.findOne({ guildId: guildContext.guild.id }).exec();
+    storage = await GuildStorage.findOne({ guildId: guildContext.guild.id }).exec();
     if (storage) {
+      this.cache(guildContext, storage);
       return storage;
     }
 
     // Create a new storage.
     guildContext.guildLog("Creating Guild Storage");
     let majorImplements = new Map<string, {}>();
-    storage = await new GuildStorage(<IGuildStorage>{
+    storage = new GuildStorage(<IGuildStorage>{
       guildId: guildContext.guild.id,
       majorImplements,
-    }).save();
+    });
+    await this.saveAndCache(guildContext, storage);
     guildContext.guildLog("Storage created: " + storage.id);
     return storage;
   }
 
+  private static cache(guildContext: GuildContext, storage: IGuildStorage): void {
+    this.CACHE[guildContext.guild.id] = storage;
+  }
+  
+  private static async saveAndCache(guildContext: GuildContext, storage: IGuildStorage): Promise<void> {
+    this.cache(guildContext, await storage.save());
+  }
+
   public static async getMajorImplement(guildContext: GuildContext, major: Major): Promise<IMajorImplement | undefined> {
     const storage = await this.findOrCreateGuildStorage(guildContext);
     const majorData = storage.majorImplements.get(major.prefix);
@@ -38,8 +56,9 @@ export class GuildStorageDatabaseService {
       storage.majorImplements.set(major.prefix, implement);
     else
       storage.majorImplements.delete(major.prefix);
-      
-    await storage.save();
+
+    storage.markModified("majorImplements");
+    await this.saveAndCache(guildContext, storage);
   }
 
   public static async getCourseImplement(guildContext: GuildContext, course: PartialCourse): Promise<ICourseImplement | undefined> {
@@ -63,7 +82,8 @@ export class GuildStorageDatabaseService {
     else
       majorImplement.courseImplements.delete(course.key);
 
-    await storage.save();
+    storage.markModified(`majorImplements.${course.major.prefix}.courseImplements`);
+    await this.saveAndCache(guildContext, storage);
   }
 
   public static async getVerificationImplement(guildContext: GuildContext): Promise<IVerificationImplement | undefined> {
@@ -74,6 +94,6 @@ export class GuildStorageDatabaseService {
   public static async setVerificationImplement(guildContext: GuildContext, implement: IVerificationImplement): Promise<void> {
     const storage = await this.findOrCreateGuildStorage(guildContext);
     storage.verificationImplement = implement;
-    await storage.save();
+    await this.saveAndCache(guildContext, storage);
   }
 }
\ No newline at end of file
diff --git a/src/services/discord/role-assignment.ts b/src/services/discord/role-assignment.ts
index cd3ee62..e0356be 100644
--- a/src/services/discord/role-assignment.ts
+++ b/src/services/discord/role-assignment.ts
@@ -53,7 +53,7 @@ export class DiscordRoleAssignmentService {
     }
 
     // Apply assignments.
-    guildContext.guildDebug(`+${rolesToAdd.length}/-${rolesToRemove.length} roles for ${DiscordUtils.describeUserForLogs(discordMember.user)}.`);
+    guildContext.guildLog(`+${rolesToAdd.length}/-${rolesToRemove.length} roles for ${DiscordUtils.describeUserForLogs(discordMember.user)}.`);
     if (rolesToAdd.length > 0)
       discordMember = await discordMember.roles.add(rolesToAdd, "StudyBot automatic role assignment.");
     if (rolesToRemove.length > 0)
diff --git a/src/services/health-assurance.ts b/src/services/health-assurance.ts
index 19044bd..b1a1c6f 100644
--- a/src/services/health-assurance.ts
+++ b/src/services/health-assurance.ts
@@ -51,10 +51,10 @@ export class HealthAssuranceService {
     }
 
     // Synchronize roles.
-    /* await MemberUpdateService.queueSynchronizeRolesManyMembers(
+    await MemberUpdateService.queueSynchronizeRolesManyMembers(
       this.guildContext, 
       members.array().filter(m => m.user.id !== this.guildContext.guild.client.user.id)
-    ); */
+    );
 
     //const users = await UserDatabaseService.getAllUsers();
     
diff --git a/src/services/implement/course/implement.ts b/src/services/implement/course/implement.ts
index 63b695a..2be60f6 100644
--- a/src/services/implement/course/implement.ts
+++ b/src/services/implement/course/implement.ts
@@ -81,15 +81,15 @@ export class CourseImplementService {
     
     // Main Role
     if(!await guildContext.guild.roles.fetch(implement.mainRoleId)) {
+      guildContext.guildLog(`Creating missing main role for course ${course.key}`);
       implement.mainRoleId = (await CourseRoleImplementService.createMainRole(guildContext, course)).id;
-      guildContext.guildLog(`Created missing main role for course ${course.key}`);
       update = true;
     }
 
     // TA Role
     if(!await guildContext.guild.roles.fetch(implement.taRoleId)) {
+      guildContext.guildLog(`Creating missing TA role for course ${course.key}`);
       implement.taRoleId = (await CourseRoleImplementService.createTARole(guildContext, course)).id;
-      guildContext.guildLog(`Created missing TA role for course ${course.key}`);
       update = true;
     }
 
@@ -97,13 +97,13 @@ export class CourseImplementService {
     for(let type of CourseImplementChannelType.values()) {
       const channel = guildContext.guild.channels.resolve(implement.channelIds[type]);
       if(!channel) {
+        guildContext.guildLog(`Creating missing ${CourseImplementChannelType[type]} channel for course ${course.key}`);
         const majorCategoryId = await MajorImplementService.getCategoryIdForNewCourseImplement(guildContext, course.major, type);
         implement.channelIds[type] = (await CourseChannelImplementService.createChannelByType(guildContext, type, course, majorCategoryId, implement.mainRoleId, implement.taRoleId)).id;
-        guildContext.guildLog(`Created missing ${CourseImplementChannelType[type]} channel for course ${course.key}`);
         update = true;
       } else {
+        guildContext.guildLog(`Resetting ${CourseImplementChannelType[type]} channel permissions for course ${course.key}`);
         await CourseChannelImplementService.resetChannelPermissionsByType(guildContext, type, implement.mainRoleId, implement.taRoleId, channel);
-        guildContext.guildLog(`Reset ${CourseImplementChannelType[type]} channel permissions for course ${course.key}`);
       }
     }
 
diff --git a/src/services/implement/major/implement.ts b/src/services/implement/major/implement.ts
index 8e3dfdd..0790f29 100644
--- a/src/services/implement/major/implement.ts
+++ b/src/services/implement/major/implement.ts
@@ -201,8 +201,8 @@ export class MajorImplementService {
     }
 
     // Pre-sort roles
-    mainRoles = mainRoles.sort((roleA, roleB) => roleA.name.localeCompare(roleB.name));
-    taRoles = taRoles.sort((roleA, roleB) => roleA.name.localeCompare(roleB.name));
+    mainRoles = mainRoles.sort((roleA, roleB) => roleB.name.localeCompare(roleA.name));
+    taRoles = taRoles.sort((roleA, roleB) => roleB.name.localeCompare(roleA.name));
 
     // Calculate role positions
     const rolePositions: Discord.RolePosition[] = [];