Shopify Wishlist memory issue - shopify

Question

We have below code in our shopify app, however it is not working and we are getting error as :
Liquid error: Memory limits exceeded
The code loops through the customer tags and checks for product id in collections and displays the products.
Can anyone please help with identifying the issue?
{% include 'breadcrumb' %}
<div class="container">
<div class="page">
<div class="title">
<h2>{{ page.title }}</h2>
</div>
<div class="page_content">
{{ page.content }}
</div>
{% if customer %}
<ul class="wishlist-items">
<li class="head">
<ul>
<li class="col-1 hidden-xs">{{'wish_list.general.image' | t}}</li>
<li class="col-2">{{'wish_list.general.item' | t}}</li>
<li class="col-3">{{'wish_list.general.price' | t}}</li>
<li class="col-4"></li>
</ul>
</li>
<li class="tbody">
<ul>
{% for tag in customer.tags %}
{% assign the_test = '' %}
{% capture tagID %}{{ tag }}{% endcapture %}
{% for tag in customer.tags %}
{% capture curTag %}{{ tag }}{% endcapture %}
{% if curTag contains tagID %}
{% assign tagID_tmp = tagID.size | minus:curTag.size %}
{% if tagID_tmp == 0 %}
{% assign the_test = tagID %}
{% else %}
{% assign the_test = '' %}
{% endif %}
{% endif %}
{% endfor %}
{% for collection in collections %}
{% paginate collection.products by collection.all_products_count %}
{% for product in collection.products %}
{% capture productID %}{{ product.id }}{% endcapture %}
{% capture used %}{{ productID }} {{ used }}{% endcapture %}
{% unless used contains productID %}
{% assign check = tag.size | minus:productID.size | modulo:2 %}
{% if check == 0 %}{% assign display_product = true %}{% else %}{% assign display_product = false %}{% endif %}
{% if display_product and the_test contains productID %}
{% assign variant_tmp = product.selected_or_first_available_variant %}
{% for variant in product.variants %}
{% if variant.available == true and variant.price < variant_tmp.price %}
{% assign variant_tmp = variant %}
{% endif %}
{% endfor %}
<li class="item">
<ul>
<li class="col-1 hidden-xs">
<a href="{{product.url | within: collection}}" class="product-image">
<img src="{{product.featured_image | product_img_url:'medium'}}" alt="{{product.title}}" />
</a>
</li>
<li class="col-2">
<a href="{{product.url | within: collection}}" class="product-image visible-xs">
<img src="{{product.featured_image | product_img_url:'medium'}}" alt="{{product.title}}" />
</a>
{{product.title}}{% if product.variants.size > 1 %} - {{variant_tmp.title}}{% endif %}
</li>
<li class="col-3"><div class="product-price"><span class="money">{{product.price | money}}</span></div></li>
<li class="col-4">
<div class="action">
<div class="wishlist">
{% form 'customer' %}
<input type='hidden' name='contact[email]' value='{{ customer.email }}'/>
<input type='hidden' name='contact[tags]' id='remove-value' value='x{{ tagID }}' />
<button type="submit" class="remove-wishlist"><i class="fa fa-close"></i></button>
{% endform %}
</div> |
<div class="addtocart">
{% if product.available %}
<form action="/cart/add" method="post" enctype="multipart/form-data">
<input type="hidden" name="quantity" value="1" />
<input type="hidden" name="id" value="{{variant_tmp.id}}" />
<button type="submit" class="add-to-cart"><i class="fa fa-shopping-cart"></i></button>
</form>
{% else %}
<i class="fa fa-shopping-cart"></i>
{% endif %}
</div>
</div>
</li>
</ul>
</li>
{% endif %}
{% endunless %}
{% endfor %}
{% endpaginate %}
{% endfor %}
{% endfor %}
</ul>
</li>
</ul>
{% else %}
<p>{{'wish_list.general.to_create_a_wishlist_please' | t}} <a href='/account/login'>{{'wish_list.general.login' | t}}</a> {{'wish_list.general.or' | t}} <a href='/account/register'>{{'wish_list.general.register' | t}}</a>.</p>
{% endif %}
</div>
</div>

Answer 1

This is because of many nested loops. All the products must be sorted out, so developers used this huge construction:
{% for collection in collections %}
{% paginate collection.products by collection.all_products_count %}
{% for product in collection.products %}
...
{% endpaginate %}
{% endfor %}
{% endfor %}
I got this error on one of our clients shop.
But we can use Shopify liquid all_products['the-handle'].variable!
Original customer tags wishlist uses products ID and x. I used product handle instead of product ID and +0 instead of x.
Customer tags with Product ID:
12345678
x12345678
xx12345678
Customer tags with handles:
some-product-handle
+0some-product-handle
+0+0some-product-handle
I had to change the code, spent a lot of time, but now it works fine, without any errors.