Add a basic singleton to save on queries.

app/Support/Amount.php

@@ -29,9 +29,9 @@ use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\Models\TransactionJournal;
 use FireflyIII\Models\UserGroup;
 use FireflyIII\Support\Facades\Preferences;
+use FireflyIII\Support\Singleton\PreferencesSingleton;
 use FireflyIII\User;
 use Illuminate\Support\Collection;
-use Illuminate\Support\Facades\Log;
 use NumberFormatter;
 
 /**
@@ -116,11 +116,20 @@ class Amount
 
     public function convertToPrimary(?User $user = null): bool
     {
+        $instance = PreferencesSingleton::getInstance();
+        $pref     = $instance->getPreference('convert_to_primary');
+        if (null === $pref) {
             if (!$user instanceof User) {
-            return true === Preferences::get('convert_to_primary', false)->data && true === config('cer.enabled');
+                $res = true === Preferences::get('convert_to_primary', false)->data && true === config('cer.enabled');
+                $instance->setPreference('convert_to_primary', $res);
+                return $res;
             }
 
-        return true === Preferences::getForUser($user, 'convert_to_primary', false)->data && true === config('cer.enabled');
+            $res = true === Preferences::getForUser($user, 'convert_to_primary', false)->data && true === config('cer.enabled');
+            $instance->setPreference('convert_to_primary', $res);
+            return $res;
+        }
+        return $pref;
     }
 
     public function getPrimaryCurrency(): TransactionCurrency

app/Support/Preferences.php

@@ -25,6 +25,7 @@ namespace FireflyIII\Support;
 
 use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Models\Preference;
+use FireflyIII\Support\Singleton\PreferencesSingleton;
 use FireflyIII\User;
 use Illuminate\Contracts\Encryption\DecryptException;
 use Illuminate\Contracts\Encryption\EncryptException;
@@ -283,6 +284,12 @@ class Preferences
      */
     public function lastActivity(): string
     {
+        $instance = PreferencesSingleton::getInstance();
+        $pref     = $instance->getPreference('last_activity');
+        if(null !== $pref) {
+            // Log::debug(sprintf('Found last activity in singleton: %s', $pref));
+            return $pref;
+        }
         $lastActivity = microtime();
         $preference   = $this->get('lastActivity', microtime());
 
@@ -292,13 +299,16 @@ class Preferences
         if (is_array($lastActivity)) {
             $lastActivity = implode(',', $lastActivity);
         }
-
-        return hash('sha256', (string) $lastActivity);
+        $setting = hash('sha256', (string) $lastActivity);
+        $instance->setPreference('last_activity', $setting);
+        return $setting;
     }
 
     public function mark(): void
     {
         $this->set('lastActivity', microtime());
+        $instance = PreferencesSingleton::getInstance();
+        $instance->setPreference('last_activity', microtime());
         Session::forget('first');
     }
 

app/Support/Singleton/PreferencesSingleton.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace FireflyIII\Support\Singleton;
+
+class PreferencesSingleton
+{
+    private static ?PreferencesSingleton $instance = null;
+
+    private array $preferences = [];
+
+    private function __construct()
+    {
+        // Private constructor to prevent direct instantiation.
+    }
+
+    public static function getInstance(): PreferencesSingleton
+    {
+        if (self::$instance === null) {
+            self::$instance = new PreferencesSingleton();
+        }
+
+        return self::$instance;
+    }
+
+    public function setPreference(string $key, mixed $value): void
+    {
+        $this->preferences[$key] = $value;
+    }
+
+    public function getPreference(string $key): mixed
+    {
+        return $this->preferences[$key] ?? null;
+    }
+
+}