Avalara Plugin uninstall take more than hour

foreach (var taxCategory in _taxCategoryService.GetAllTaxCategories())
            {
                _genericAttributeService.SaveAttribute<string>(taxCategory, AvalaraTaxDefaults.TaxCodeDescriptionAttribute, null);
                _genericAttributeService.SaveAttribute<string>(taxCategory, AvalaraTaxDefaults.TaxCodeTypeAttribute, null);
            }
            foreach (var customer in _customerService.GetAllCustomers())
            {
                _genericAttributeService.SaveAttribute<string>(customer, AvalaraTaxDefaults.EntityUseCodeAttribute, null);
            }
            foreach (var customerRole in _customerService.GetAllCustomerRoles(true))
            {
                _genericAttributeService.SaveAttribute<string>(customerRole, AvalaraTaxDefaults.EntityUseCodeAttribute, null);
            }
            foreach (var product in _productService.SearchProducts(showHidden: true))
            {
                _genericAttributeService.SaveAttribute<string>(product, AvalaraTaxDefaults.EntityUseCodeAttribute, null);
            }
            foreach (var attribute in _checkoutAttributeService.GetAllCheckoutAttributes())
            {
                _genericAttributeService.SaveAttribute<string>(attribute, AvalaraTaxDefaults.EntityUseCodeAttribute, null);
            }

            //settings            
            _taxSettings.ActiveTaxProviderSystemName = _taxPluginManager.LoadAllPlugins()
                .FirstOrDefault(taxProvider => !taxProvider.PluginDescriptor.SystemName.Equals(AvalaraTaxDefaults.SystemName))
                ?.PluginDescriptor.SystemName;
            _settingService.SaveSetting(_taxSettings);
            _widgetSettings.ActiveWidgetSystemNames.Remove(AvalaraTaxDefaults.SystemName);
            _settingService.SaveSetting(_widgetSettings);
            _settingService.DeleteSetting<AvalaraTaxSettings>();