diff --git a/frontend/app/player/web/network/crypto.ts b/frontend/app/player/web/network/crypto.ts
index 0c9de001e..dbb5d9a04 100644
--- a/frontend/app/player/web/network/crypto.ts
+++ b/frontend/app/player/web/network/crypto.ts
@@ -1,3 +1,4 @@
+import { gunzipSync } from 'fflate'
 
 const u8aFromHex = (hexString:string) =>
   Uint8Array.from(hexString.match(/.{1,2}/g).map((byte) => parseInt(byte, 16)))
@@ -18,7 +19,22 @@ export function decryptSessionBytes(cypher: Uint8Array, keyString: string): Prom
 
 	return crypto.subtle.importKey("raw", byteKey, { name: "AES-CBC" }, false, ["decrypt"])
 		.then(key => crypto.subtle.decrypt({ name: "AES-CBC", iv: iv}, key, cypher))
-		.then((bArray: ArrayBuffer) => new Uint8Array(bArray)) //?? TS doesn not catch the `decrypt`` returning type
+		.then((bArray: ArrayBuffer) => new Uint8Array(bArray))
+		.then(async (u8Array: Uint8Array) => {
+			const now = performance.now()
+			const data = gunzipSync(u8Array)
+			console.debug(
+				"Decompression time",
+				performance.now() - now,
+				'size',
+				Math.floor(u8Array.byteLength/1024),
+				'->',
+				Math.floor(data.byteLength/1024),
+				'kb'
+			)
+			return data
+		})
+	//?? TS doesn not catch the `decrypt`` returning type
 }
 
 
diff --git a/frontend/package.json b/frontend/package.json
index 5467b3cc7..972b3362e 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -31,6 +31,7 @@
     "classnames": "^2.3.1",
     "copy-to-clipboard": "^3.3.1",
     "deep-diff": "^1.0.2",
+    "fflate": "^0.7.4",
     "html-to-image": "^1.9.0",
     "html2canvas": "^1.4.1",
     "immutable": "^4.0.0-rc.12",
diff --git a/frontend/yarn.lock b/frontend/yarn.lock
index b67995034..dbb069dfb 100644
--- a/frontend/yarn.lock
+++ b/frontend/yarn.lock
@@ -11047,6 +11047,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"fflate@npm:^0.7.4":
+  version: 0.7.4
+  resolution: "fflate@npm:0.7.4"
+  checksum: 5e749eb3a6ed61a0f6c55756abf9f4258f06f60505db689e22d18503dd252ca5af656d32668e4b7b20714adf8b313febf695d23863a8352f23e325baee0f672d
+  languageName: node
+  linkType: hard
+
 "figgy-pudding@npm:^3.4.1, figgy-pudding@npm:^3.5.1, figgy-pudding@npm:^3.5.2":
   version: 3.5.2
   resolution: "figgy-pudding@npm:3.5.2"
@@ -17215,6 +17222,7 @@ __metadata:
     eslint-plugin-react: ^7.29.4
     eslint-plugin-react-hooks: ^4.5.0
     faker: ^5.5.3
+    fflate: ^0.7.4
     file-loader: ^6.2.0
     flow-bin: ^0.115.0
     html-to-image: ^1.9.0
diff --git a/tracker/tracker/src/main/app/index.ts b/tracker/tracker/src/main/app/index.ts
index 66dcc767a..f70d6bf90 100644
--- a/tracker/tracker/src/main/app/index.ts
+++ b/tracker/tracker/src/main/app/index.ts
@@ -22,9 +22,6 @@ import type {
   FromWorkerData,
 } from '../../common/interaction.js'
 
-// @ts-ignore
-window.gzip = gzip
-
 interface TypedWorker extends Omit<Worker, 'postMessage'> {
   postMessage(data: ToWorkerData): void
 }