weird text sizing?

src/server/main.zig

@@ -7,6 +7,13 @@ const shared = @import("shared");
 const chunk = @import("chunk.zig");
 const server = @import("server.zig");
 
+const dt          : f32 = 1.0 / 200.0;
+var   t           : f32 = 0;
+var   gt          : f32 = 0;
+var   accumulator : f32 = 0;
+var   k           : f32 = 1.0;
+var   frame       : i32 = 0;
+
 var stdout: *std.io.Writer = undefined;
 
 pub fn main() !void {
@@ -43,7 +50,21 @@ pub fn main() !void {
     var the_chunk = try shared.chunk.initChunk(allocator);
     defer shared.chunk.deinitChunk(&the_chunk, allocator);
 
+    var old_time = std.time.nanoTimestamp();
+
     while (true) {
+        const new_time = std.time.nanoTimestamp();
+        var frame_time : f32 = @as(f32, @floatFromInt(new_time - old_time)) / 1_000_000_000.0;
+        old_time = new_time;
+
+        if (frame_time > 0.25)
+            frame_time = 0.25;
+
+        t += frame_time;
+        accumulator += frame_time * k;
+
+        // std.log.info("t: {}", .{t});
+
         while (try server.host.service(0)) |event| switch (event) {
             .connect => |data| {
                 _ = data;