diff --git a/client/public/stylesheets/layout/layout.css b/client/public/stylesheets/layout/layout.css
index 2dadac0d..8dc6e68d 100644
--- a/client/public/stylesheets/layout/layout.css
+++ b/client/public/stylesheets/layout/layout.css
@@ -140,6 +140,16 @@
 	align-items: center;
 }
 
+#slow-delete-popup {
+	align-self: center;
+	display:flex;
+	justify-self: center;
+    position: absolute;
+    width: fit-content;
+    height: fit-content;
+    z-index: 9999999999;
+}
+
 #log-panel {
 	position: absolute;
 	right: 0px;
diff --git a/client/public/stylesheets/style/style.css b/client/public/stylesheets/style/style.css
index 368571d0..37609fbd 100644
--- a/client/public/stylesheets/style/style.css
+++ b/client/public/stylesheets/style/style.css
@@ -699,7 +699,7 @@ nav.ol-panel> :last-child {
     overflow: hidden;
     width: 70%;
     max-width: 1200px;
-    z-index: 99999;
+    z-index: 999999;
 }
 
 @media (min-width: 1700px) {
@@ -796,7 +796,7 @@ nav.ol-panel> :last-child {
     position: fixed;
     top: 0px;
     width: 100%;
-    z-index: 9999;
+    z-index: 99999;
 }
 
 #authentication-form {
@@ -1148,7 +1148,7 @@ dl.ol-data-grid dd {
     background-color: var(--background-slate-blue);
     color: white;
     position: absolute;
-    z-index: 9999;
+    z-index: 999999;
 }
 
 .ol-panel.ol-dialog {
@@ -1178,8 +1178,10 @@ dl.ol-data-grid dd {
 }
 
 .ol-dialog-footer {
+    align-content: center;
     border-top: 1px solid var(--background-grey);
     display: flex;
+    justify-content: center;
     padding-top: 15px;
     row-gap: 10px;
 }
diff --git a/client/src/constants/constants.ts b/client/src/constants/constants.ts
index 0e01b227..3c633a25 100644
--- a/client/src/constants/constants.ts
+++ b/client/src/constants/constants.ts
@@ -209,4 +209,7 @@ export const MGRS_PRECISION_10KM = 2;
 export const MGRS_PRECISION_1KM  = 3;
 export const MGRS_PRECISION_100M = 4;
 export const MGRS_PRECISION_10M  = 5;
-export const MGRS_PRECISION_1M   = 6;
\ No newline at end of file
+export const MGRS_PRECISION_1M   = 6;
+
+export const DELETE_CYCLE_TIME     = 0.1;
+export const DELETE_SLOW_THRESHOLD = 50;
\ No newline at end of file
diff --git a/client/src/dialog/dialog.ts b/client/src/dialog/dialog.ts
new file mode 100644
index 00000000..78b4cf94
--- /dev/null
+++ b/client/src/dialog/dialog.ts
@@ -0,0 +1,19 @@
+import { Panel } from "../panels/panel";
+
+export class Dialog extends Panel {
+
+    constructor( element:string ) {
+        super( element );
+    }
+
+    hide() {
+        super.hide();
+        document.getElementById( "gray-out" )?.classList.toggle("hide", true);
+    }
+
+    show() {
+        super.show();
+        document.getElementById( "gray-out" )?.classList.toggle("hide", false);
+    }
+
+}
\ No newline at end of file
diff --git a/client/src/olympusapp.ts b/client/src/olympusapp.ts
index a8d9483d..551b6363 100644
--- a/client/src/olympusapp.ts
+++ b/client/src/olympusapp.ts
@@ -34,21 +34,26 @@ export class OlympusApp {
     #map: Map | null = null;
 
     /* Managers */
+    #dialogManager!: Manager;
+    #missionManager: MissionManager | null = null;
+    #panelsManager: Manager | null = null;
+    #pluginsManager: PluginsManager | null = null;
+    #popupsManager: Manager | null = null;
     #serverManager: ServerManager | null = null;
+    #shortcutManager: ShortcutManager | null = null;
+    #toolbarsManager: Manager | null = null;
     #unitsManager: UnitsManager | null = null;
     #weaponsManager: WeaponsManager | null = null;
-    #missionManager: MissionManager | null = null;
-    #pluginsManager: PluginsManager | null = null;
-    #panelsManager: Manager | null = null;
-    #popupsManager: Manager | null = null;
-    #toolbarsManager: Manager | null = null;
-    #shortcutManager: ShortcutManager | null = null;
 
     constructor() {
 
     }
 
     // TODO add checks on null
+    getDialogManager() {
+        return this.#dialogManager as Manager;
+    }
+
     getMap() {
         return this.#map as Map;
     }
@@ -163,16 +168,14 @@ export class OlympusApp {
         /* Initialize base functionalitites */
         this.#map = new Map('map-container');
 
-        this.#serverManager = new ServerManager();
-        this.#unitsManager = new UnitsManager();
-        this.#weaponsManager = new WeaponsManager();
         this.#missionManager = new MissionManager();
-
-        this.#shortcutManager = new ShortcutManager();
-
         this.#panelsManager = new Manager();
         this.#popupsManager = new Manager();
+        this.#serverManager = new ServerManager();
+        this.#shortcutManager = new ShortcutManager();
         this.#toolbarsManager = new Manager();
+        this.#unitsManager = new UnitsManager();
+        this.#weaponsManager = new WeaponsManager();
 
         // Panels
         this.getPanelsManager()
@@ -186,7 +189,8 @@ export class OlympusApp {
             .add("unitList", new UnitListPanel("unit-list-panel", "unit-list-panel-content"))
 
         // Popups
-        this.getPopupsManager().add("infoPopup", new Popup("info-popup"));
+        this.getPopupsManager()
+            .add("infoPopup", new Popup("info-popup"));
 
         // Toolbars
         this.getToolbarsManager().add("primaryToolbar", new PrimaryToolbar("primary-toolbar"))
diff --git a/client/src/server/servermanager.ts b/client/src/server/servermanager.ts
index cb6286f6..c5321799 100644
--- a/client/src/server/servermanager.ts
+++ b/client/src/server/servermanager.ts
@@ -541,14 +541,15 @@ export class ServerManager {
     }
 
     setConnected(newConnected: boolean) {
-        if (this.#connected != newConnected)
+        if (this.#connected != newConnected) {
             newConnected ? (getApp().getPopupsManager().get("infoPopup") as Popup).setText("Connected to DCS Olympus server") : (getApp().getPopupsManager().get("infoPopup") as Popup).setText("Disconnected from DCS Olympus server");
-        this.#connected = newConnected;
-
-        if (this.#connected) {
-            document.querySelector("#splash-screen")?.classList.add("hide");
-            document.querySelector("#gray-out")?.classList.add("hide");
+            if (newConnected) {
+                document.getElementById("splash-screen")?.classList.add("hide");
+                document.getElementById("gray-out")?.classList.add("hide");
+            }
         }
+
+        this.#connected = newConnected;
     }
 
     getConnected() {
diff --git a/client/src/unit/unitsmanager.ts b/client/src/unit/unitsmanager.ts
index 398d074a..7e6fa97d 100644
--- a/client/src/unit/unitsmanager.ts
+++ b/client/src/unit/unitsmanager.ts
@@ -4,7 +4,7 @@ import { Unit } from "./unit";
 import { bearingAndDistanceToLatLng, deg2rad, getGroundElevation, getUnitDatabaseByCategory, keyEventWasInInput, latLngToMercator, mToFt, mercatorToLatLng, msToKnots, polyContains, polygonArea, randomPointInPoly, randomUnitBlueprint } from "../other/utils";
 import { CoalitionArea } from "../map/coalitionarea/coalitionarea";
 import { groundUnitDatabase } from "./databases/groundunitdatabase";
-import { DataIndexes, GAME_MASTER, IADSDensities, IDLE, MOVE_UNIT } from "../constants/constants";
+import { DELETE_CYCLE_TIME, DELETE_SLOW_THRESHOLD, DataIndexes, GAME_MASTER, IADSDensities, IDLE, MOVE_UNIT } from "../constants/constants";
 import { DataExtractor } from "../server/dataextractor";
 import { citiesDatabase } from "./citiesDatabase";
 import { aircraftDatabase } from "./databases/aircraftdatabase";
@@ -14,35 +14,40 @@ import { TemporaryUnitMarker } from "../map/markers/temporaryunitmarker";
 import { Popup } from "../popups/popup";
 import { HotgroupPanel } from "../panels/hotgrouppanel";
 import { Contact, UnitData, UnitSpawnTable } from "../interfaces";
+import { Dialog } from "../dialog/dialog";
 
 /** The UnitsManager handles the creation, update, and control of units. Data is strictly updated by the server ONLY. This means that any interaction from the user will always and only
  * result in a command to the server, executed by means of a REST PUT request. Any subsequent change in data will be reflected only when the new data is sent back by the server. This strategy allows
  * to avoid client/server and client/client inconsistencies.
  */
 export class UnitsManager {
-    #units: { [ID: number]: Unit };
     #copiedUnits: UnitData[];
-    #selectionEventDisabled: boolean = false;
     #deselectionEventDisabled: boolean = false;
     #requestDetectionUpdate: boolean = false;
+    #selectionEventDisabled: boolean = false;
+    #slowDeleteDialog!:Dialog;
+    #units: { [ID: number]: Unit };
+
 
     constructor() {
-        this.#units = {};
         this.#copiedUnits = [];
+        this.#units = {};
 
+        document.addEventListener('commandModeOptionsChanged', () => { Object.values(this.#units).forEach((unit: Unit) => unit.updateVisibility()) });
+        document.addEventListener('contactsUpdated', (e: CustomEvent) => { this.#requestDetectionUpdate = true });
         document.addEventListener('copy', () => this.selectedUnitsCopy());
-        document.addEventListener('paste', () => this.pasteUnits());
-        document.addEventListener('unitSelection', (e: CustomEvent) => this.#onUnitSelection(e.detail));
-        document.addEventListener('unitDeselection', (e: CustomEvent) => this.#onUnitDeselection(e.detail));
         document.addEventListener('deleteSelectedUnits', () => this.selectedUnitsDelete());
         document.addEventListener('explodeSelectedUnits', () => this.selectedUnitsDelete(true));
-        document.addEventListener('keyup', (event) => this.#onKeyUp(event));
         document.addEventListener('exportToFile', () => this.exportToFile());
         document.addEventListener('importFromFile', () => this.importFromFile());
-        document.addEventListener('contactsUpdated', (e: CustomEvent) => { this.#requestDetectionUpdate = true });
-        document.addEventListener('commandModeOptionsChanged', () => { Object.values(this.#units).forEach((unit: Unit) => unit.updateVisibility()) });
-        document.addEventListener('selectedUnitsChangeSpeed', (e: any) => { this.selectedUnitsChangeSpeed(e.detail.type) });
+        document.addEventListener('keyup', (event) => this.#onKeyUp(event));
+        document.addEventListener('paste', () => this.pasteUnits());
         document.addEventListener('selectedUnitsChangeAltitude', (e: any) => { this.selectedUnitsChangeAltitude(e.detail.type) });
+        document.addEventListener('selectedUnitsChangeSpeed', (e: any) => { this.selectedUnitsChangeSpeed(e.detail.type) });
+        document.addEventListener('unitDeselection', (e: CustomEvent) => this.#onUnitDeselection(e.detail));
+        document.addEventListener('unitSelection', (e: CustomEvent) => this.#onUnitSelection(e.detail));
+
+        this.#slowDeleteDialog = new Dialog( "slow-delete-dialog" );
     }
 
     /**
@@ -638,7 +643,7 @@ export class UnitsManager {
             try {
                 groundElevation = parseFloat(response);
             } catch {
-                console.log("Simulate fire fight: could not retrieve ground elevation")
+                console.warn("Simulate fire fight: could not retrieve ground elevation")
             }
             for (let idx in selectedUnits) {
                 selectedUnits[idx].simulateFireFight(latlng, groundElevation);
@@ -754,14 +759,24 @@ export class UnitsManager {
             return;
         }
 
-        var immediate = false;
-        if (selectedUnits.length > 20)
-            immediate = confirm(`You are trying to delete ${selectedUnits.length} units, do you want to delete them immediately? This may cause lag for players.`)
-
-        for (let idx in selectedUnits) {
-            selectedUnits[idx].delete(explosion, immediate);
+        const doDelete = (explosion = false, immediate = false) => {
+            const selectedUnits = this.getSelectedUnits();
+            for (let idx in selectedUnits) {
+                selectedUnits[idx].delete(explosion, immediate);
+            }
+            this.#showActionMessage(selectedUnits, `deleted`);
         }
-        this.#showActionMessage(selectedUnits, `deleted`);
+
+        if (selectedUnits.length >= DELETE_SLOW_THRESHOLD)
+            this.#showSlowDeleteDialog(selectedUnits).then((action:any) => {
+                if (action === "delete-slow")
+                    doDelete(explosion, false);
+                else if (action === "delete-immediate")
+                    doDelete(explosion, true);
+            })
+        else
+            doDelete(explosion);
+
     }
 
     /** Compute the destinations of every unit in the selected units. This function preserves the relative positions of the units, and rotates the whole formation by rotation.
@@ -1083,4 +1098,32 @@ export class UnitsManager {
         else if (units.length > 1)
             (getApp().getPopupsManager().get("infoPopup") as Popup).setText(`${units[0].getUnitName()} and ${units.length - 1} other units ${message}`);
     }
+   
+    #showSlowDeleteDialog(selectedUnits:Unit[]) {
+        let button:HTMLButtonElement | null = null;
+        const deletionTime = Math.round( selectedUnits.length * DELETE_CYCLE_TIME ).toString();
+        const dialog = this.#slowDeleteDialog;
+        const element = dialog.getElement();
+        const listener = (ev:MouseEvent) => {
+            if (ev.target instanceof HTMLButtonElement && ev.target.matches("[data-action]"))
+                button = ev.target;
+        }
+
+        element.querySelectorAll(".deletion-count").forEach( el => el.innerHTML = selectedUnits.length.toString() );
+        element.querySelectorAll(".deletion-time").forEach( el => el.innerHTML = deletionTime );
+        dialog.show();
+
+        return new Promise((resolve) => {
+            element.addEventListener("click", listener);
+
+            const interval = setInterval(() => {
+                if (button instanceof HTMLButtonElement ) {
+                    clearInterval(interval);
+                    dialog.hide();
+                    element.removeEventListener("click", listener);
+                    resolve( button.getAttribute("data-action") );
+                }
+            }, 250);
+        });
+    }
 }
\ No newline at end of file
diff --git a/client/views/other/dialogs.ejs b/client/views/other/dialogs.ejs
index 1d56160c..55cee3f6 100644
--- a/client/views/other/dialogs.ejs
+++ b/client/views/other/dialogs.ejs
@@ -304,4 +304,27 @@
         <button class="ol-button-apply" data-on-click="applycommandModeOptions">Apply</button>
         <button class="ol-button-close" data-on-click="closeDialog">Close</button>
     </div>
-</div>
\ No newline at end of file
+</div>
+
+
+<div id="slow-delete-dialog" class="ol-panel ol-dialog hide" oncontextmenu="return false;">
+    <div class="ol-dialog-header">
+        <h3 id="unit-name">Confirm deletion method</h3>
+    </div>
+
+    <div class="ol-dialog-content">
+        <p>You are trying to delete a large amount of units (<span class="deletion-count"></span>), which can cause the server to lag for players.</p>
+        <p>You may:
+            <ul>
+                <li>delete in batches (less lag but Olympus cannot process any additional orders until<br /> all units have been deleted);</li>
+                <li>delete immediately (you can continue to give Olympus orders but players may<br />experience lag while this happens);</li>
+                <li>cancel this instruction.</li>
+            </ul></p>
+    </div>
+
+    <div class="ol-dialog-footer ol-group">
+        <button data-action="delete-slow">Delete in batches (~<span class="deletion-time"></span>s)</button>
+        <button data-action="delete-immediate">Delete immediately</button>
+        <button data-action="delete-cancel">Cancel</button>
+    </div>
+</div>