diff --git a/server/src/lib/score-import/framework/score-importing/insert-score.test.ts b/server/src/lib/score-import/framework/score-importing/insert-score.test.ts
index 3eee2b36e..0c9feaebb 100644
--- a/server/src/lib/score-import/framework/score-importing/insert-score.test.ts
+++ b/server/src/lib/score-import/framework/score-importing/insert-score.test.ts
@@ -16,7 +16,10 @@ t.test("#QueueScoreInsert, #InsertQueue", async (t) => {
 
 	t.test("Single Queue Test", async (t) => {
 		// fake score doc
-		const res = await QueueScoreInsert({ scoreID: "foo" } as unknown as ScoreDocument);
+		const res = await QueueScoreInsert({
+			scoreID: "foo",
+			userID: 1,
+		} as unknown as ScoreDocument);
 
 		t.equal(
 			res,
@@ -25,7 +28,7 @@ t.test("#QueueScoreInsert, #InsertQueue", async (t) => {
 		);
 
 		// this is the best way to get the size of the queue
-		const flushSize = await InsertQueue();
+		const flushSize = await InsertQueue(1);
 
 		t.equal(flushSize, 1, "QueueScoreInsert should append the score to the queue.");
 
@@ -42,17 +45,22 @@ t.test("#QueueScoreInsert, #InsertQueue", async (t) => {
 		t.end();
 	});
 
-	let r = await InsertQueue(); // flush queue just incase former test fails.
+	let r = await InsertQueue(1); // flush queue just incase former test fails.
 
 	t.test("Queue Overflow Test", async (t) => {
 		for (let i = 0; i < 499; i++) {
 			// eslint-disable-next-line no-await-in-loop
-			await QueueScoreInsert({ scoreID: i, chartID: "test" } as unknown as ScoreDocument);
+			await QueueScoreInsert({
+				scoreID: i,
+				chartID: "test",
+				userID: 1,
+			} as unknown as ScoreDocument);
 		}
 
 		const overflowRes = await QueueScoreInsert({
 			scoreID: "foo",
 			chartID: "test",
+			userID: 1,
 		} as unknown as ScoreDocument);
 
 		t.equal(
@@ -61,7 +69,7 @@ t.test("#QueueScoreInsert, #InsertQueue", async (t) => {
 			"Appending 500 items to the queue should result in them being inserted."
 		);
 
-		const flushRes = await InsertQueue();
+		const flushRes = await InsertQueue(1);
 
 		t.equal(flushRes, 0, "The queue should now be empty.");
 
@@ -79,20 +87,25 @@ t.test("#QueueScoreInsert, #InsertQueue", async (t) => {
 		t.end();
 	});
 
-	r = await InsertQueue(); // flush queue just incase former test fails.
+	r = await InsertQueue(1); // flush queue just incase former test fails.
 
 	t.equal(r, 0, "Queue should be empty after test.");
 
 	t.test("Queue Dedupe Test", async (t) => {
-		await QueueScoreInsert({ scoreID: 1, chartID: "foo" } as unknown as ScoreDocument);
+		await QueueScoreInsert({
+			scoreID: 1,
+			chartID: "foo",
+			userID: 1,
+		} as unknown as ScoreDocument);
 		const r2 = await QueueScoreInsert({
 			scoreID: 1,
 			chartID: "foo",
+			userID: 1,
 		} as unknown as ScoreDocument);
 
 		t.equal(r2, null, "Should return null when a duplicate scoreID is submitted");
 
-		const flushRes = await InsertQueue();
+		const flushRes = await InsertQueue(1);
 
 		t.equal(flushRes, 1, "Should flush 1 score document");
 
@@ -103,5 +116,37 @@ t.test("#QueueScoreInsert, #InsertQueue", async (t) => {
 		t.equal(dbRes.length, 1, "Should only insert one document");
 	});
 
+	t.test("Should give separate users separate queues.", async (t) => {
+		await QueueScoreInsert({
+			scoreID: "1",
+			chartID: "foo",
+			userID: 1,
+		} as unknown as ScoreDocument);
+		await QueueScoreInsert({
+			scoreID: "2",
+			chartID: "foo",
+			userID: 2,
+		} as unknown as ScoreDocument);
+
+		const r1 = await InsertQueue(1);
+		t.equal(r1, 1, "Queue for userID 1 should have length 1.");
+
+		const r2 = await InsertQueue(2);
+		t.equal(r2, 1, "Queue for userID 2 should also have length 1.");
+
+		t.end();
+	});
+
+	t.test("Should not throw if InsertQueue is called on an empty queue.", async (t) => {
+		try {
+			await InsertQueue(1);
+			t.pass("Did not throw when inserting an empty queue.");
+		} catch (err) {
+			t.fail(err);
+		}
+
+		t.end();
+	});
+
 	t.end();
 });
diff --git a/server/src/lib/score-import/framework/score-importing/insert-score.ts b/server/src/lib/score-import/framework/score-importing/insert-score.ts
index 4a21077ec..37738f5ad 100644
--- a/server/src/lib/score-import/framework/score-importing/insert-score.ts
+++ b/server/src/lib/score-import/framework/score-importing/insert-score.ts
@@ -1,46 +1,68 @@
-import { ScoreDocument } from "tachi-common";
+import { ScoreDocument, integer } from "tachi-common";
 import db from "external/mongo/db";
 import CreateLogCtx from "lib/logger/logger";
 
 const logger = CreateLogCtx(__filename);
-const ScoreQueue: ScoreDocument[] = [];
-export let ScoreIDs: Set<string> = new Set();
 const MAX_PIPELINE_LENGTH = 500;
 
+interface ScoreQueue {
+	queue: ScoreDocument[];
+	scoreIDSet: Set<string>;
+}
+
+const ScoreQueues: Record<integer, ScoreQueue> = {};
+
 /**
- * Adds a score to a queue to be inserted in batch to the database.
- * @param score - The score document to queue.
- * @returns True on success, The amount of scores inserted on auto-pipeline-flush, and null if
- * the score provided is already loaded.
+ * Returns this user's score queue. A score queue is a temporary place scores are saved
+ * so that they can be inserted into the database in bulk.
+ *
+ * This massively improves performance on large imports instead of constantly running single imports.
+ *
+ * If a score queue does not exist for the user, one is created.
  */
-export function QueueScoreInsert(score: ScoreDocument) {
-	if (ScoreIDs.has(score.scoreID)) {
-		// skip
-		logger.verbose(`Triggered skip for ID ${score.scoreID}`);
-		return null;
+function GetOrSetScoreQueue(userID: integer) {
+	const queue = ScoreQueues[userID];
+
+	if (!queue) {
+		return SetScoreQueue(userID);
 	}
 
-	ScoreQueue.push(score);
-	ScoreIDs.add(score.scoreID);
+	return queue;
+}
 
-	if (ScoreQueue.length >= MAX_PIPELINE_LENGTH) {
-		logger.verbose(`Triggered pipeline flush with len ${ScoreQueue.length}.`);
-		return InsertQueue();
-	}
+export function GetScoreQueueMaybe(userID: integer): ScoreQueue | undefined {
+	return ScoreQueues[userID];
+}
 
-	return true;
+function SetScoreQueue(userID: integer) {
+	const queue: ScoreQueue = {
+		queue: [],
+		scoreIDSet: new Set(),
+	};
+
+	ScoreQueues[userID] = queue;
+
+	return queue;
 }
 
 /**
- * Bulk inserts the entire Queue.
- * @warn Be cautious of inducing race conditions when using this function.
+ * Adds a new score to the given queue.
  */
-export async function InsertQueue() {
-	const temp = ScoreQueue.splice(0);
-	if (temp.length !== 0) {
-		ScoreIDs = new Set();
+function AddToScoreQueue(scoreQueue: ScoreQueue, score: ScoreDocument) {
+	scoreQueue.queue.push(score);
+	scoreQueue.scoreIDSet.add(score.scoreID);
+}
+
+export async function InsertQueue(userID: integer) {
+	const scoreQueue = GetOrSetScoreQueue(userID);
+
+	const queuedScores = scoreQueue.queue.splice(0);
+
+	if (queuedScores.length !== 0) {
+		delete ScoreQueues[userID];
+
 		try {
-			await db.scores.insert(temp);
+			await db.scores.insert(queuedScores);
 		} catch (err) {
 			logger.warn(
 				`Triggered duplicate key protection. Race condition protected against, but this is not good.`
@@ -49,5 +71,32 @@ export async function InsertQueue() {
 		}
 	}
 
-	return temp.length;
+	return queuedScores.length;
+}
+
+/**
+ * Adds a score to a queue to be inserted in batch to the database.
+ * @param score - The score document to queue.
+ * @returns True on success, The amount of scores inserted on auto-pipeline-flush, and null if
+ * the score provided is already loaded.
+ */
+export function QueueScoreInsert(score: ScoreDocument) {
+	const scoreQueue = GetOrSetScoreQueue(score.userID);
+
+	if (scoreQueue.scoreIDSet.has(score.scoreID)) {
+		// skip
+		logger.verbose(`Score ID ${score.scoreID} was already queued to be imported.`);
+		return null;
+	}
+
+	AddToScoreQueue(scoreQueue, score);
+
+	logger.debug(`ScoreQueue for ${score.userID} is now at ${scoreQueue.queue.length}.`);
+
+	if (scoreQueue.queue.length >= MAX_PIPELINE_LENGTH) {
+		logger.verbose(`Triggered pipeline flush with len ${scoreQueue.queue.length}.`);
+		return InsertQueue(score.userID);
+	}
+
+	return true;
 }
diff --git a/server/src/lib/score-import/framework/score-importing/score-importing.ts b/server/src/lib/score-import/framework/score-importing/score-importing.ts
index 99d600d30..8571f2b22 100644
--- a/server/src/lib/score-import/framework/score-importing/score-importing.ts
+++ b/server/src/lib/score-import/framework/score-importing/score-importing.ts
@@ -25,7 +25,7 @@ import {
 import { DryScore } from "../common/types";
 import { OrphanScore } from "../orphans/orphans";
 import { HydrateScore } from "./hydrate-score";
-import { InsertQueue, QueueScoreInsert, ScoreIDs } from "./insert-score";
+import { GetScoreQueueMaybe, InsertQueue, QueueScoreInsert } from "./insert-score";
 import { CreateScoreID } from "./score-id";
 
 /**
@@ -92,7 +92,7 @@ export async function ImportAllIterableData<D, C>(
 
 	// Flush the score queue out after finishing most of the import. This ensures no scores get left in the
 	// queue.
-	const emptied = await InsertQueue();
+	const emptied = await InsertQueue(userID);
 
 	if (emptied) {
 		logger.verbose(`Emptied ${emptied} documents from score queue.`);
@@ -309,7 +309,8 @@ async function HydrateAndInsertScore(
 		return null;
 	}
 
-	if (ScoreIDs.has(scoreID)) {
+	// If this users score queue
+	if (GetScoreQueueMaybe(userID)?.scoreIDSet.has(scoreID)) {
 		logger.verbose(`Skipped score.`);
 		return null;
 	}
@@ -323,7 +324,7 @@ async function HydrateAndInsertScore(
 		res = await QueueScoreInsert(score);
 	}
 
-	// emergency state - this is a last resort for avoiding doubled imports
+	// this is a last resort for avoiding doubled imports
 	if (res === null) {
 		logger.verbose(`Skipped score - Race Condition protection triggered.`);
 		return null;