### Godot version

8449592d92eaeef990f5502b419d491ee3eeb7a6

### System information

Windows 11

### Issue description

Zooming in the script editor on an empty script freezes the entire editor for a few seconds, but if the file is large then it freezes for 4-5 seconds (which is unacceptable). Looks like a recent regression.

### Steps to reproduce

Just zoom in/out on the large script file.

### Minimal reproduction project

N/A
last_cluster_valid = last_cluster_valid && ((glyph_info[i].codepoint != 0) || (p_sd->text[glyph_info[i].cluster] == 0x0009) || (u_isblank(p_sd->text[glyph_info[i].cluster]) && (gl.advance != 0)) || (!u_isblank(p_sd->text[glyph_info[i].cluster]) && !u_isgraph(p_sd->text[glyph_info[i].cluster])));
			}
		}
		if (p_direction == HB_DIRECTION_LTR || p_direction == HB_DIRECTION_TTB) {
			for (unsigned int j = last_cluster_index; j < glyph_count; j++) {
				w[j].end = p_end;
			}
		}
		w[last_cluster_index].count = glyph_count - last_cluster_index;
		if (p_direction == HB_DIRECTION_RTL || p_direction == HB_DIRECTION_BTT) {
			w[last_cluster_index].flags |= GRAPHEME_IS_RTL;
		}
		if (last_cluster_valid) {
			w[last_cluster_index].flags |= GRAPHEME_IS_VALID;
		}
		
		int failed_subrun_start = p_end + 1;
		int failed_subrun_end = p_start;
		for (unsigned int i = 0; i < glyph_count; i++) {
			if ((w[i].flags & GRAPHEME_IS_VALID) == GRAPHEME_IS_VALID) {
				if (failed_subrun_start != p_end + 1) {
					_shape_run(p_sd, failed_subrun_start, failed_subrun_end, p_script, p_direction, p_fonts, p_span, p_fb_index + 1, p_start, p_end);
					failed_subrun_start = p_end + 1;
					failed_subrun_end = p_start;
				}
				for (int j = 0; j < w[i].count; j++) {
					if (p_sd->orientation == ORIENTATION_HORIZONTAL) {
						p_sd->ascent = MAX(p_sd->ascent, -w[i + j].y_off);
						p_sd->descent = MAX(p_sd->descent, w[i + j].y_off);
					} else {