diff --git a/src/core/clients/opencga/opencga-parent-class.js b/src/core/clients/opencga/opencga-parent-class.js
index ade9e97c01..437a6d19c8 100644
--- a/src/core/clients/opencga/opencga-parent-class.js
+++ b/src/core/clients/opencga/opencga-parent-class.js
@@ -168,9 +168,8 @@ export default class OpenCGAParentClass {
     }
 
     generateKey(params) {
-        // return `${new Error().stack.split("\n    at ").slice(0, 5).join("|")}${params?.study}`;
-        // Josemi 2022-01-28 NOTE: Temporally disable key generation, see issue https://github.com/opencb/jsorolla/issues/380
-        return "";
+        // if concurrent=true the request bypass the request queue in RestClient
+        return params?.concurrent !== true ? `${new Error().stack.split("\n    at ").slice(0, 5).join("|")}${params?.study}` : false;
     }
 
 }
diff --git a/src/core/clients/rest-client.js b/src/core/clients/rest-client.js
index a67ae137d2..80e2017055 100644
--- a/src/core/clients/rest-client.js
+++ b/src/core/clients/rest-client.js
@@ -69,7 +69,10 @@ export class RestClient {
     call(url, options, k) {
         let method = "GET";
         let async = true;
-        // const key = RestClient.hash(k || "RandomString");
+
+        // k is false iff there is concurrent=true param in the call
+        const key = k ? RestClient.hash(k) : null;
+
         let dataResponse = null;
 
         const eventFire = new CustomEvent("request", {
@@ -93,26 +96,25 @@ export class RestClient {
         // Creating the promise
         return new Promise((resolve, reject) => {
 
-            // let key = `${new Error().stack.split("\n    at ").slice(0,6).join("|")}`;
             const request = new XMLHttpRequest();
 
-            // Josemi 2022-01-28 NOTE: disabled requests registry until due to issues with images until we found a better solution
-            // Related issue: https://github.com/opencb/jsorolla/issues/380
-            // if (this.requests[key]) {
-            //     // pending prev request
-            //     this.requests[key] = {...this.requests[key], pending: true};
-
-            // } else {
-            //     // pending false as there is no prev request
-            //     this.requests[key] = {pending: false, request, url, key};
-            // }
+            // k is false iff there is concurrent=true param in the call
+            if (key) {
+                if (this.requests[key]) {
+                    // pending prev request
+                    this.requests[key] = {...this.requests[key], pending: true};
+                } else {
+                    // pending false as there is no prev request
+                    this.requests[key] = {pending: false, request, url, key};
+                }
+            }
 
             request.onload = event => {
                 // console.log("on load EVENT", event);
                 // console.log("on load URL", url);
 
                 // request is fulfilled
-                // delete this.requests[key];
+                delete this.requests[key];
 
                 if (request.status === 200) {
 
@@ -199,18 +201,17 @@ export class RestClient {
                 request.send();
             }
 
-            // if (this.requests[key]) {
-            //     // console.log("FULL LIST", Object.entries(this.requests))
-            //     // console.log("this.requests[key]", this.requests[key]);
-
-            //     if (this.requests[key].pending) {
-            //         console.warn("aborting request", this.requests[key].url);
-            //         this.requests[key].request.abort();
-            //         delete this.requests[key];
-            //     } else {
-            //         // not aborting
-            //     }
-            // }
+            if (this.requests[key]) {
+                // console.log("FULL LIST", Object.entries(this.requests))
+                // console.log("this.requests[key]", this.requests[key]);
+                if (this.requests[key].pending) {
+                    console.warn("aborting request", this.requests[key].url);
+                    this.requests[key].request.abort();
+                    delete this.requests[key];
+                } else {
+                    // not aborting
+                }
+            }
 
         });
     }
diff --git a/src/webcomponents/file/file-preview.js b/src/webcomponents/file/file-preview.js
index ff37e65ef7..b50b61a15d 100644
--- a/src/webcomponents/file/file-preview.js
+++ b/src/webcomponents/file/file-preview.js
@@ -98,7 +98,7 @@ export default class FilePreview extends LitElement {
 
     fileIdsObserver() {
         if (this.opencgaSession && this.fileIds) {
-            this.opencgaSession.opencgaClient.files().info(this.fileIds.map(fileId => fileId.replaceAll("/", ":")).join(","), {study: this.opencgaSession.study.fqn})
+            this.opencgaSession.opencgaClient.files().info(this.fileIds.map(fileId => fileId.replaceAll("/", ":")).join(","), {study: this.opencgaSession.study.fqn, concurrent: true})
                 .then(response => {
                     this.files = response.responses[0].results;
                 })
@@ -132,7 +132,7 @@ export default class FilePreview extends LitElement {
                 case "UNKNOWN":
                 case "TAB_SEPARATED_VALUES":
                     fileWithContent.contentType = "text";
-                    this.opencgaSession.opencgaClient.files().head(fileWithContent.id, params)
+                    this.opencgaSession.opencgaClient.files().head(fileWithContent.id, {...params, concurrent: true})
                         .then(response => {
                             const {format, content} = response.getResult(0);
                             this.format = format;
@@ -147,7 +147,7 @@ export default class FilePreview extends LitElement {
                     break;
                 case "JSON":
                     fileWithContent.contentType = "json";
-                    this.opencgaSession.opencgaClient.files().head(fileWithContent.id, params)
+                    this.opencgaSession.opencgaClient.files().head(fileWithContent.id, {...params, concurrent: true})
                         .then(response => {
                             const {content} = response.getResult(0);
                             try {
@@ -165,7 +165,7 @@ export default class FilePreview extends LitElement {
                     break;
                 case "BAM":
                     fileWithContent.contentType = "json";
-                    this.opencgaSession.opencgaClient.files().info(fileWithContent.id, {study: this.opencgaSession.study.fqn})
+                    this.opencgaSession.opencgaClient.files().info(fileWithContent.id, {study: this.opencgaSession.study.fqn, concurrent: true})
                         .then(response => {
                             const {attributes} = response.getResult(0);
                             fileWithContent.content = attributes?.alignmentHeader ?? {content: "No content"};
@@ -174,7 +174,7 @@ export default class FilePreview extends LitElement {
                     break;
                 case "IMAGE":
                     fileWithContent.contentType = "image";
-                    this.opencgaSession.opencgaClient.files().image(fileWithContent.id, {study: this.opencgaSession.study.fqn})
+                    this.opencgaSession.opencgaClient.files().image(fileWithContent.id, {study: this.opencgaSession.study.fqn, concurrent: true})
                         .then(response => {
                             fileWithContent.content = response.responses[0].results[0].content;
                             this.requestUpdate();