Shopify Functions Limits for Slice 'n Save Discounts

Slice ‘n Save is powered by Shopify Functions — Shopify’s serverless compute layer for discount logic. Shopify imposes fixed and dynamic resource limits on all functions, which affects how many discount items, conditions, and criteria you can include in a single discount rule. This page outlines those limits so you can plan your discounts accordingly.

You can create up to 25 Automatic discounts at a time across your Shopify store. Once you reach this limit, you must delete an existing automatic discount before creating a new one.

Per-Discount Type Limits

Different discount categories have different capacity limits. The tables below show approximate instruction counts at various item, condition, and criteria configurations. Use these as a guide when designing complex discount rules.

Basic

Items	Conditions	Criteria	Instruction Count	Input	Output
1	3	3	2.9973 M	2.63 kB	0.28 kB
5	3	3	4.5599 M	3.52 kB	0.84 kB
10	3	3	6.9614 M	4.67 kB	1.55 kB
16	3	3	10.4966 M	6.09 kB	2.41 kB

Advanced

Items	Conditions	Criteria	Instruction Count	Input	Output
1	3	3	3.1187 M	2.63 kB	0.28 kB
5	3	3	4.8460 M	3.67 kB	0.84 kB
10	3	3	7.4354 M	0.84 kB	1.55 kB
15	3	3	10.4798 M	6.29 kB	2.27 kB
1	6	5	3.7736 M	3.50 kB	0.37 kB
5	6	5	6.7475 M	4.54 kB	1.31 kB
9	6	5	10.5827 M	5.58 kB	2.25 kB
35	1	1	10.9313 M	10.87 kB	1.81 kB

Basic

Items	Conditions	Criteria	Instruction Count	Input	Output
1	4	N/A	2.1336 M	2.30 kB	0.20 kB
15	4	N/A	3.3181 M	5.59 kB	0.20 kB
30	4	N/A	4.5777 M	9.14 kB	0.20 kB
45	4	N/A	5.8114 M	12.68 kB	0.20 kB
1	7	N/A	2.4391 M	2.82 kB	0.20 kB
15	7	N/A	3.6213 M	6.11 kB	0.20 kB
30	7	N/A	4.8799 M	9.65 kB	0.20 kB

Advanced

Items	Conditions	Criteria	Instruction Count	Input	Output
1	4	N/A	2.1452 M	2.27 kB	0.20 kB
15	4	N/A	3.4848 M	5.93 kB	0.20 kB
30	4	N/A	4.9076 M	9.86 kB	0.20 kB
45	4	N/A	6.3122 M	13.79 kB	0.20 kB
1	7	N/A	2.4231 M	2.80 kB	0.20 kB
15	7	N/A	3.7667 M	6.46 kB	0.20 kB
30	7	N/A	5.1918 M	10.39 kB	0.20 kB

Basic

Items	Conditions	Criteria	Instruction Count	Input	Output
1	4	N/A	2.4555 M	3.78 kB	0.20 kB
15	4	N/A	2.9070 M	5.94 kB	0.20 kB
30	4	N/A	4.9108 M	10.65 kB	0.20 kB
1	7	N/A	2.7778 M	4.30 kB	0.20 kB
15	7	N/A	3.9491 M	7.61 kB	0.20 kB
30	7	N/A	5.2144 M	11.16 kB	0.20 kB

Advanced

Items	Conditions	Criteria	Instruction Count	Input	Output
1	4	N/A	2.4725 M	3.74 kB	0.20 kB
15	4	N/A	3.8141 M	7.40 kB	0.20 kB
30	4	N/A	5.2428 M	11.33 kB	0.20 kB
1	7	N/A	2.7610 M	4.26 kB	0.20 kB
15	7	N/A	4.0823 M	7.91 kB	0.20 kB
30	7	N/A	5.5090 M	11.84 kB	0.20 kB

Items	Conditions	Criteria	Instruction Count	Input	Output
1	1	2	3.3862 M	3.52 kB	0.87 kB
15	1	2	8.7318 M	7.18 kB	2.81 kB
19	1	2	10.7333 M	8.22 kB	3.36 kB

Items	Conditions	Criteria	Instruction Count	Input	Output
1	2	1	3.1627 M	3.47 kb	0.60 kb
15	2	1	6.6208 M	7.14 kb	1.89 kb
28	2	1	10.8969 M	10.54 kb	3.08 kb
1	2	2	3.2942 M	3.64 kb	0.60 kb
21	2	2	10.8841 M	8.61 kb	2.35 kb

Items	Conditions	Criteria	Instruction Count	Input	Output
8	2	1	5.2674 M	8.97 kb	0.6 kb
8	2	2	6.2455 M	9.37 kb	1.89 kb
10	3	3	9.2320 M	12.40 kb	0.73 kb

Shopify Functions Fixed Resource Limits

These limits are hard-coded by Shopify and apply to every function execution, regardless of cart size or discount complexity.

Resource	Limit
Compiled binary size	256 kB
Runtime linear memory	10,000 kB
Runtime stack memory	512 kB
Logs written to STDERR	1 kB (truncated)

Shopify Functions Dynamic Resource Limits

These limits govern how much compute work a function can perform during a single execution. They apply to carts with up to 200 line items.

Resource	Limit (up to 200 line items)
Execution instruction count	11 million instructions
Function input	64 kB
Function output	20 kB

For carts with more than 200 line items, the dynamic resource limits above scale proportionally as the number of cart lines increases.

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Discount Types

Shopify Functions Limits for Slice 'n Save Discounts

Per-Discount Type Limits

Shopify Functions Fixed Resource Limits

Shopify Functions Dynamic Resource Limits

​Per-Discount Type Limits

​Shopify Functions Fixed Resource Limits

​Shopify Functions Dynamic Resource Limits

Per-Discount Type Limits

Shopify Functions Fixed Resource Limits

Shopify Functions Dynamic Resource Limits