LocalList (collection on stack)

Create and use

var buffer = new LocalList<Boo>();
buffer.Add(boo1);
buffer.Add(boo2);
...

foreach (var boo in buffer) {
   Console.WriteLine(boo.Id);
}

buffer.Where(boo => boo.Id > 5);

Benchmarks

Method	Count	Mean	Error	StdDev	Ratio	Gen 0	Gen 1	Allocated
List_Add	4	3.441 ns	0.0354 ns	0.0331 ns	1.00	0.0014	-	9 B
LocalVector_Add	4	2.638 ns	0.0327 ns	0.0306 ns	0.77	-	-	-
Span_Add	4	2.073 ns	0.0179 ns	0.0158 ns	0.60	0.0009	-	6 B
List_Iteration	4	7.571 ns	0.1358 ns	0.1270 ns	1.00	0.0014	-	9 B
LocalVector_Iteration	4	5.916 ns	0.0508 ns	0.0450 ns	0.78	-	-	-
Span_Iteration	4	8.091 ns	0.0854 ns	0.0799 ns	1.07	0.0009	-	6 B
List_GroupBy	4	38.972 ns	0.3626 ns	0.3392 ns	1.00	0.0108	-	68 B
LocalVector_GroupBy	4	50.495 ns	0.4076 ns	0.3812 ns	1.30	-	-	-
List_Join	4	58.397 ns	0.3899 ns	0.3647 ns	1.00	0.0144	-	90 B
LocalVector_Join	4	33.049 ns	0.2622 ns	0.2324 ns	0.57	-	-	-
List_ManyLinq	4	126.200 ns	1.0256 ns	0.8564 ns	1.00	0.0345	-	218 B
LocalVector_ManyLinq	4	125.057 ns	0.4907 ns	0.4350 ns	0.99	-	-	-
List_Remove	4	15.161 ns	0.1612 ns	0.1508 ns	1.00	0.0014	-	9 B
LocalVector_Remove	4	11.383 ns	0.0603 ns	0.0564 ns	0.75	-	-	-
List_Select	4	15.843 ns	0.0604 ns	0.0536 ns	1.00	0.0025	-	16 B
LocalVector_Select	4	10.475 ns	0.2011 ns	0.2235 ns	0.66	-	-	-
List_ToArray	4	8.124 ns	0.0916 ns	0.0812 ns	1.00	0.0023	-	14 B
LocalVector_ToArray	4	5.604 ns	0.0536 ns	0.0448 ns	0.69	0.0009	-	6 B
Span_ToArray	4	1.922 ns	0.0514 ns	0.0429 ns	0.24	0.0009	-	6 B
List_Where	4	14.750 ns	0.1341 ns	0.1254 ns	1.00	0.0025	-	16 B
List_FindAll	4	11.030 ns	0.0779 ns	0.0729 ns	0.75	0.0028	-	18 B
LocalVector_Where	4	10.277 ns	0.0990 ns	0.0877 ns	0.70	-	-	-
List_Where_ToArray	4	21.149 ns	0.4222 ns	0.7504 ns	1.00	0.0041	-	26 B
LocalVector_Where_ToArray	4	13.078 ns	0.1922 ns	0.1798 ns	0.63	0.0006	-	4 B
List_Add	10	12.926 ns	0.1850 ns	0.1731 ns	1.00	0.0052	-	33 B
LocalVector_Add	10	5.502 ns	0.0313 ns	0.0244 ns	0.42	-	-	-
Span_Add	10	3.852 ns	0.0196 ns	0.0153 ns	0.30	0.0017	-	10 B
List_Iteration	10	9.937 ns	0.2311 ns	0.2923 ns	1.00	0.0022	-	14 B
LocalVector_Iteration	10	9.701 ns	0.0504 ns	0.0472 ns	0.97	-	-	-
Span_Iteration	10	8.521 ns	0.0899 ns	0.0797 ns	0.85	0.0017	-	10 B
List_GroupBy	10	71.959 ns	0.5214 ns	0.4877 ns	1.00	0.0161	-	102 B
LocalVector_GroupBy	10	83.630 ns	0.2430 ns	0.2273 ns	1.16	-	-	-
List_Join	10	111.531 ns	0.3870 ns	0.3232 ns	1.00	0.0265	-	167 B
LocalVector_Join	10	117.925 ns	0.3964 ns	0.3708 ns	1.06	-	-	-
List_ManyLinq	10	238.136 ns	1.0246 ns	0.9584 ns	1.00	0.0584	0.0004	366 B
LocalVector_ManyLinq	10	425.516 ns	1.3847 ns	1.2952 ns	1.79	-	-	-
List_Remove	10	31.604 ns	0.2091 ns	0.1956 ns	1.00	0.0021	-	14 B
LocalVector_Remove	10	52.423 ns	0.3658 ns	0.3422 ns	1.66	-	-	-
List_Select	10	22.865 ns	0.0749 ns	0.0664 ns	1.00	0.0033	-	21 B
LocalVector_Select	10	17.396 ns	0.0883 ns	0.0737 ns	0.76	-	-	-
List_ToArray	10	8.174 ns	0.0553 ns	0.0461 ns	1.00	0.0038	-	24 B
LocalVector_ToArray	10	11.211 ns	0.0623 ns	0.0583 ns	1.37	0.0017	-	10 B
Span_ToArray	10	2.284 ns	0.0195 ns	0.0182 ns	0.28	0.0017	-	10 B
List_Where	10	22.720 ns	0.0935 ns	0.0874 ns	1.00	0.0033	-	21 B
List_FindAll	10	20.528 ns	0.1968 ns	0.1744 ns	0.90	0.0050	-	31 B
LocalVector_Where	10	18.991 ns	0.0860 ns	0.0805 ns	0.84	-	-	-
List_Where_ToArray	10	23.612 ns	0.1297 ns	0.1213 ns	1.00	0.0056	-	35 B
LocalVector_Where_ToArray	10	24.195 ns	0.1408 ns	0.1317 ns	1.02	0.0014	-	9 B
List_Add	15	13.709 ns	0.1196 ns	0.1119 ns	1.00	0.0052	-	33 B
LocalVector_Add	15	11.522 ns	0.0865 ns	0.0767 ns	0.84	0.0023	-	14 B
Span_Add	15	5.003 ns	0.0331 ns	0.0309 ns	0.36	0.0023	-	14 B
List_Iteration	15	13.132 ns	0.3489 ns	0.3093 ns	1.00	0.0028	-	18 B
LocalVector_Iteration	15	14.372 ns	0.0674 ns	0.0598 ns	1.09	0.0010	-	6 B
Span_Iteration	15	8.857 ns	0.1515 ns	0.1343 ns	0.67	0.0023	-	14 B
List_GroupBy	15	86.259 ns	0.4682 ns	0.4380 ns	1.00	0.0168	-	106 B
LocalVector_GroupBy	15	111.916 ns	0.8427 ns	0.7882 ns	1.30	0.0027	-	17 B
List_Join	15	148.744 ns	0.8599 ns	0.8043 ns	1.00	0.0349	-	219 B
LocalVector_Join	15	231.299 ns	1.5131 ns	1.4154 ns	1.56	0.0019	-	13 B
List_ManyLinq	15	326.887 ns	1.4260 ns	1.3339 ns	1.00	0.0759	0.0008	477 B
LocalVector_ManyLinq	15	814.412 ns	3.0927 ns	2.8929 ns	2.49	0.0076	-	54 B
List_Remove	15	45.089 ns	0.5050 ns	0.4477 ns	1.00	0.0028	-	18 B
LocalVector_Remove	15	103.205 ns	0.9664 ns	0.9039 ns	2.29	0.0010	-	6 B
List_Select	15	28.500 ns	0.4309 ns	0.3820 ns	1.00	0.0039	-	25 B
LocalVector_Select	15	24.813 ns	0.1065 ns	0.0996 ns	0.87	0.0010	-	6 B
List_ToArray	15	8.664 ns	0.0555 ns	0.0519 ns	1.00	0.0051	-	32 B
LocalVector_ToArray	15	15.803 ns	0.0898 ns	0.0840 ns	1.82	0.0033	-	21 B
Span_ToArray	15	2.527 ns	0.0138 ns	0.0129 ns	0.29	0.0023	-	14 B
List_Where	15	28.194 ns	0.1655 ns	0.1468 ns	1.00	0.0039	-	25 B
List_FindAll	15	27.428 ns	0.1162 ns	0.1087 ns	0.97	0.0080	-	50 B
LocalVector_Where	15	27.389 ns	0.0990 ns	0.0926 ns	0.97	0.0010	-	6 B
List_Where_ToArray	15	33.249 ns	0.2275 ns	0.2128 ns	1.00	0.0097	-	61 B
LocalVector_Where_ToArray	15	36.947 ns	0.2595 ns	0.2300 ns	1.11	0.0041	-	26 B
List_Add	25	21.078 ns	0.0719 ns	0.0637 ns	1.00	0.0097	-	61 B
LocalVector_Add	25	21.144 ns	0.1350 ns	0.1263 ns	1.00	0.0047	-	30 B
Span_Add	25	8.589 ns	0.1726 ns	0.2244 ns	0.41	0.0036	-	22 B
List_Iteration	25	16.807 ns	0.2576 ns	0.2151 ns	1.00	0.0041	-	26 B
LocalVector_Iteration	25	21.567 ns	0.3299 ns	0.3086 ns	1.28	0.0023	-	14 B
Span_Iteration	25	11.611 ns	0.2293 ns	0.2145 ns	0.69	0.0036	-	22 B
List_GroupBy	25	137.070 ns	2.6324 ns	3.1337 ns	1.00	0.0229	-	144 B
LocalVector_GroupBy	25	183.210 ns	3.5955 ns	4.4156 ns	1.34	0.0082	-	52 B
List_Join	25	239.267 ns	2.1203 ns	1.9833 ns	1.00	0.0557	0.0004	350 B
LocalVector_Join	25	542.522 ns	7.6519 ns	6.3897 ns	2.27	0.0046	-	29 B
List_ManyLinq	25	521.390 ns	2.7673 ns	2.4532 ns	1.00	0.1167	0.0015	734 B
LocalVector_ManyLinq	25	1,986.088 ns	20.1014 ns	18.8029 ns	3.81	0.0183	-	122 B
List_Remove	25	79.091 ns	1.5147 ns	1.4168 ns	1.00	0.0040	-	26 B
LocalVector_Remove	25	248.374 ns	1.7898 ns	1.6742 ns	3.14	0.0023	-	14 B
List_Select	25	39.141 ns	0.7578 ns	0.9022 ns	1.00	0.0052	-	33 B
LocalVector_Select	25	37.954 ns	0.2017 ns	0.1887 ns	0.97	0.0023	-	14 B
List_ToArray	25	9.472 ns	0.0838 ns	0.0784 ns	1.00	0.0076	0.0000	48 B
LocalVector_ToArray	25	25.182 ns	0.1474 ns	0.1379 ns	2.66	0.0059	-	37 B
Span_ToArray	25	2.879 ns	0.0285 ns	0.0267 ns	0.30	0.0036	-	22 B
List_Where	25	38.883 ns	0.2699 ns	0.2393 ns	1.00	0.0052	-	33 B
List_FindAll	25	41.154 ns	0.3769 ns	0.3526 ns	1.06	0.0137	-	86 B
LocalVector_Where	25	41.617 ns	0.2291 ns	0.2143 ns	1.07	0.0023	-	14 B
List_Where_ToArray	25	48.577 ns	0.2971 ns	0.2779 ns	1.00	0.0146	-	92 B
LocalVector_Where_ToArray	25	61.181 ns	0.3528 ns	0.3300 ns	1.26	0.0078	-	50 B