### 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
if (!p_sd->chars_valid) {
		p_sd->chars.clear();
		const UChar *data = p_sd->utf16.get_data();
		UErrorCode err = U_ZERO_ERROR;
		int prev = -1;
		int i = 0;
		Vector<ShapedTextDataAdvanced::Span> &spans = p_sd->spans;
		if (p_sd->parent != RID()) {
			ShapedTextDataAdvanced *parent_sd = shaped_owner.get_or_null(p_sd->parent);
			ERR_FAIL_COND(!parent_sd->valid);
			spans = parent_sd->spans;
		}
		while (i < spans.size()) {
			if (spans[i].start > p_sd->end) {
				
			}
			if (spans[i].end < p_sd->start) {
				i++;
				continue;
			}
			int r_start = MAX(0, spans[i].start - p_sd->start);
			String language = spans[i].language;
			while (i + 1 < spans.size() && language == spans[i + 1].language) {
				i++;
			}
			int r_end = MIN(spans[i].end - p_sd->start, p_sd->text.length());
			UBreakIterator *bi = ubrk_open(UBRK_CHARACTER, (language.is_empty()) ? TranslationServer::get_singleton()->get_tool_locale().ascii().get_data() : language.ascii().get_data(), data + _convert_pos_inv(p_sd, r_start), _convert_pos_inv(p_sd, r_end - r_start), &err);
			if (U_SUCCESS(err)) {
				while (ubrk_next(bi) != UBRK_DONE) {
					int pos = _convert_pos(p_sd, ubrk_current(bi)) + r_start + p_sd->start;