diff --git a/aegisub/src/dialog_progress.cpp b/aegisub/src/dialog_progress.cpp
index ed840cc2d..8d37e7333 100644
--- a/aegisub/src/dialog_progress.cpp
+++ b/aegisub/src/dialog_progress.cpp
@@ -56,7 +56,7 @@ public:
 	}
 
 	void SetProgress(int64_t cur, int64_t max) {
-		Main().Async([=]{ dialog->gauge->SetValue(mid<int>(0, double(cur) / max * 100, 100)); });
+		Main().Async([=]{ dialog->SetProgress(mid<int>(0, double(cur) / max * 300, 300)); });
 	}
 
 	void Log(std::string const& str) {
@@ -79,9 +79,11 @@ public:
 DialogProgress::DialogProgress(wxWindow *parent, wxString const& title_text, wxString const& message)
 : wxDialog(parent, -1, title_text, wxDefaultPosition, wxDefaultSize, wxBORDER_RAISED)
 , pulse_timer(GetEventHandler())
+, progress_current(0)
+, progress_target(0)
 {
 	title = new wxStaticText(this, -1, title_text, wxDefaultPosition, wxDefaultSize, wxALIGN_CENTRE | wxST_NO_AUTORESIZE);
-	gauge = new wxGauge(this, -1, 100, wxDefaultPosition, wxSize(300,20));
+	gauge = new wxGauge(this, -1, 300, wxDefaultPosition, wxSize(300,20));
 	text = new wxStaticText(this, -1, message, wxDefaultPosition, wxDefaultSize, wxALIGN_CENTRE | wxST_NO_AUTORESIZE);
 	cancel_button = new wxButton(this, wxID_CANCEL);
 	log_output = new wxTextCtrl(this, -1, "", wxDefaultPosition, wxSize(600, 240), wxTE_MULTILINE | wxTE_READONLY);
@@ -160,6 +162,17 @@ void DialogProgress::OnShow(wxShowEvent&) {
 }
 
 void DialogProgress::OnIdle(wxIdleEvent&) {
+	if (progress_current != progress_target) {
+		using namespace std::chrono;
+		auto now = steady_clock::now();
+		int ms = mid<int>(0, duration_cast<milliseconds>(now - progress_anim_start_time).count(), progress_anim_duration);
+		int dist = (progress_target - progress_anim_start_value) * ms / progress_anim_duration;
+		if (dist) {
+			progress_current = progress_anim_start_value + dist;
+			gauge->SetValue(progress_current);
+		}
+	}
+
 	if (!pending_log) return;
 
 	if (log_output->IsEmpty()) {
@@ -180,3 +193,16 @@ void DialogProgress::OnCancel(wxCommandEvent &) {
 	cancel_button->Enable(false);
 	cancel_button->SetLabelText(_("Cancelling..."));
 }
+
+void DialogProgress::SetProgress(int target) {
+	using namespace std::chrono;
+
+	progress_anim_start_value = progress_current;
+	auto now = steady_clock::now();
+	if (progress_target == 0)
+		progress_anim_duration = 1000;
+	else
+		progress_anim_duration = std::max<int>(100, duration_cast<milliseconds>(now - progress_anim_start_time).count() * 11 / 10);
+	progress_anim_start_time = now;
+	progress_target = target;
+}
diff --git a/aegisub/src/dialog_progress.h b/aegisub/src/dialog_progress.h
index 52618d855..2dc3dc54c 100644
--- a/aegisub/src/dialog_progress.h
+++ b/aegisub/src/dialog_progress.h
@@ -17,6 +17,7 @@
 /// @ingroup utility
 ///
 
+#include <chrono>
 #include <wx/dialog.h>
 #include <wx/timer.h>
 
@@ -43,11 +44,18 @@ class DialogProgress : public wxDialog, public agi::BackgroundRunner {
 	wxTimer pulse_timer;
 
 	wxString pending_log;
+	int progress_anim_start_value;
+	int progress_current;
+	int progress_target;
+	std::chrono::steady_clock::time_point progress_anim_start_time;
+	int progress_anim_duration;
 
 	void OnShow(wxShowEvent&);
 	void OnCancel(wxCommandEvent &);
 	void OnIdle(wxIdleEvent&);
 
+	void SetProgress(int target);
+
 public:
 	/// Constructor
 	/// @param parent Parent window of the dialog